heres also a log from a started playback try … in the end the same behavior, cant tune channel, error occured, whatever …
same happens from time to time … only solution, reboot server wich is a pain when a shield is not with direct access 
…
Dec 10, 2017 02:26:05.027 [3508] DEBUG - Auth: authenticated user 1 as myusername
Dec 10, 2017 02:26:05.027 [31484] DEBUG - Request: [192.168.1.101:62900 (Subnet)] POST /livetv/dvrs/6/channels/452/tune (12 live) GZIP Signed-in Token (myusername)
Dec 10, 2017 02:26:05.028 [31484] DEBUG - DVR:Subscription: Starting a new rolling subscription for session tuig8dtd9ae1zjxdbbe9z2j3 channel 452.
Dec 10, 2017 02:26:25.021 [3508] DEBUG - Auth: authenticated user 1 as myusername
Dec 10, 2017 02:26:25.022 [3509] DEBUG - Auth: authenticated user 1 as myusername
Dec 10, 2017 02:26:25.023 [31483] DEBUG - Request: [192.168.1.101:62915 (Subnet)] GET /library/sections (16 live) GZIP Signed-in Token (myusername)
Dec 10, 2017 02:26:25.023 [3509] DEBUG - Auth: authenticated user 1 as myusername
Dec 10, 2017 02:26:25.024 [31500] DEBUG - Request: [192.168.1.101:62916 (Subnet)] GET /media/providers (16 live) GZIP Signed-in Token (myusername)
Dec 10, 2017 02:26:25.027 [3509] DEBUG - Auth: authenticated user 1 as myusername
Dec 10, 2017 02:26:25.028 [31501] DEBUG - Request: [192.168.1.101:62910 (Subnet)] GET /music/iTunes (16 live) GZIP Signed-in Token (myusername)
Dec 10, 2017 02:26:25.030 [31502] DEBUG - Request: [192.168.1.101:62917 (Subnet)] GET /hubs?excludeFields=summary&count=12&includeEmpty=1&includeFeaturedTags=1&excludePlaylists=1 (16 live) GZIP Signed-in Token (myusername)
Dec 10, 2017 02:26:25.030 [3509] DEBUG - Completed: [192.168.1.101:62915] 200 GET /library/sections (16 live) GZIP 7ms 862 bytes (pipelined: 1)
Dec 10, 2017 02:26:25.031 [31502] DEBUG - HubCache: Retrieving ‘1/home.continue/hubs/12/de’ from the cache.
Dec 10, 2017 02:26:25.031 [3509] DEBUG - Completed: [192.168.1.101:62910] 404 GET /music/iTunes (16 live) GZIP 9ms 379 bytes (pipelined: 1)
Dec 10, 2017 02:26:25.032 [31502] DEBUG - HubCache: Retrieving ‘1/home.ondeck/hubs/12/de’ from the cache.
Dec 10, 2017 02:26:25.032 [31502] DEBUG - HubCache: Retrieving ‘1/home.movies.recent/hubs/12/de’ from the cache.
Dec 10, 2017 02:26:25.033 [31502] DEBUG - HubCache: Retrieving ‘1/home.television.recent/hubs/12/de’ from the cache.
Dec 10, 2017 02:26:25.034 [31502] DEBUG - HubCache: Retrieving ‘1/home.videos.recent/hubs/12/de’ from the cache.
Dec 10, 2017 02:26:25.035 [31502] DEBUG - HubCache: Retrieving ‘1/home.photos.recent/hubs/12/de’ from the cache.
Dec 10, 2017 02:26:25.035 [31502] DEBUG - HubCache: Retrieving ‘1/home.music.recent/hubs/12/de’ from the cache.
Dec 10, 2017 02:26:25.036 [3509] DEBUG - Completed: [192.168.1.101:62916] 200 GET /media/providers (16 live) GZIP 12ms 1119 bytes (pipelined: 1)
Dec 10, 2017 02:26:25.038 [31502] DEBUG - We’re going to try to auto-select an audio stream for account 1.
Dec 10, 2017 02:26:25.039 [31502] DEBUG - Selecting best audio stream for part ID 10707 (autoselect: 1 language: de)
Dec 10, 2017 02:26:25.039 [31502] DEBUG - Audio Stream: 23968, Subtitle Stream: -1
Dec 10, 2017 02:26:25.040 [31502] DEBUG - We’re going to try to auto-select an audio stream for account 1.
Dec 10, 2017 02:26:25.040 [31502] DEBUG - Selecting best audio stream for part ID 10686 (autoselect: 1 language: de)
Dec 10, 2017 02:26:25.041 [31502] DEBUG - Audio Stream: 23919, Subtitle Stream: -1
Dec 10, 2017 02:26:25.042 [31502] DEBUG - We’re going to try to auto-select an audio stream for account 1.
Dec 10, 2017 02:26:25.042 [31502] DEBUG - Selecting best audio stream for part ID 10687 (autoselect: 1 language: de)
Dec 10, 2017 02:26:25.042 [31502] DEBUG - Audio Stream: 23922, Subtitle Stream: -1
Dec 10, 2017 02:26:25.044 [31502] DEBUG - We’re going to try to auto-select an audio stream for account 1.
Dec 10, 2017 02:26:25.044 [31502] DEBUG - Selecting best audio stream for part ID 10688 (autoselect: 1 language: de)
Dec 10, 2017 02:26:25.044 [31502] DEBUG - Audio Stream: 23925, Subtitle Stream: -1
Dec 10, 2017 02:26:25.045 [31502] DEBUG - We’re going to try to auto-select an audio stream for account 1.
Dec 10, 2017 02:26:25.045 [31502] DEBUG - Selecting best audio stream for part ID 10706 (autoselect: 1 language: de)
Dec 10, 2017 02:26:25.045 [31502] DEBUG - Audio Stream: 23965, Subtitle Stream: -1
Dec 10, 2017 02:26:25.047 [31502] DEBUG - We’re going to try to auto-select an audio stream for account 1.
Dec 10, 2017 02:26:25.047 [31502] DEBUG - Selecting best audio stream for part ID 10708 (autoselect: 1 language: de)
Dec 10, 2017 02:26:25.047 [31502] DEBUG - Audio Stream: 23971, Subtitle Stream: -1
Dec 10, 2017 02:26:25.083 [3509] DEBUG - Completed: [192.168.1.101:62917] 200 GET /hubs?excludeFields=summary&count=12&includeEmpty=1&includeFeaturedTags=1&excludePlaylists=1 (16 live) GZIP 55ms 8423 bytes (pipelined: 1)
Dec 10, 2017 02:26:25.169 [3508] DEBUG - Auth: authenticated user 1 as myusername
Dec 10, 2017 02:26:25.169 [3509] DEBUG - Auth: authenticated user 1 as myusername
Dec 10, 2017 02:26:25.170 [31483] DEBUG - Request: [192.168.1.101:62917 (Subnet)] GET /hubs/home/recentlyAdded?type=1 (16 live) Page 12-38 GZIP Signed-in Token (myusername)
Dec 10, 2017 02:26:25.170 [31501] DEBUG - Request: [192.168.1.101:62916 (Subnet)] GET /hubs/home/recentlyAdded?type=2 (16 live) Page 12-38 GZIP Signed-in Token (myusername)
Dec 10, 2017 02:26:25.173 [31483] DEBUG - Setting container serialization range to [12, 38] (total=-1)
Dec 10, 2017 02:26:25.208 [31483] DEBUG - It took 60.000000 ms to retrieve 27 items.
Dec 10, 2017 02:26:25.211 [31483] DEBUG - Setting container serialization range to [12, 38] (total=51)
Dec 10, 2017 02:26:25.245 [3509] DEBUG - Completed: [192.168.1.101:62917] 200 GET /hubs/home/recentlyAdded?type=1 (16 live) GZIP Page 12-38 75ms 16878 bytes (pipelined: 2)
Dec 10, 2017 02:26:25.314 [31501] DEBUG - It took 90.000000 ms to retrieve 75 items.
Dec 10, 2017 02:26:25.407 [31501] DEBUG - Requesting more shows since stacking only returned 13 items.
Dec 10, 2017 02:26:25.914 [31501] DEBUG - It took 460.000000 ms to retrieve 500 items.
Dec 10, 2017 02:26:25.947 [3508] DEBUG - Auth: authenticated user 1 as myusername
Dec 10, 2017 02:26:25.947 [3509] DEBUG - Auth: authenticated user 1 as myusername
Dec 10, 2017 02:26:25.947 [31499] DEBUG - Request: [192.168.1.101:62917 (Subnet)] GET /:/prefs (16 live) GZIP Signed-in Token (myusername)
Dec 10, 2017 02:26:25.953 [3509] DEBUG - Auth: authenticated user 1 as myusername
Dec 10, 2017 02:26:25.954 [3509] DEBUG - Auth: authenticated user 1 as myusername
Dec 10, 2017 02:26:25.954 [31502] DEBUG - Request: [192.168.1.101:62910 (Subnet)] GET /accounts/1 (16 live) GZIP Signed-in Token (myusername)
Dec 10, 2017 02:26:25.956 [31483] DEBUG - Request: [192.168.1.101:62915 (Subnet)] GET /myplex/account (16 live) GZIP Signed-in Token (myusername)
Dec 10, 2017 02:26:25.957 [31500] DEBUG - Request: [192.168.1.101:62918 (Subnet)] GET /system/:/prefs (16 live) GZIP Signed-in Token (myusername)
Dec 10, 2017 02:26:25.957 [31500] DEBUG - [com.plexapp.system] Sending command over HTTP (GET): /system/:/prefs
Dec 10, 2017 02:26:25.957 [31500] DEBUG - HTTP requesting GET http://127.0.0.1:47015/system/:/prefs
Dec 10, 2017 02:26:25.957 [3509] DEBUG - Completed: [192.168.1.101:62910] 200 GET /accounts/1 (16 live) GZIP 9ms 513 bytes (pipelined: 2)
Dec 10, 2017 02:26:25.958 [3509] DEBUG - Completed: [192.168.1.101:62915] 200 GET /myplex/account (16 live) GZIP 4ms 755 bytes (pipelined: 2)
Dec 10, 2017 02:26:25.970 [31500] DEBUG - HTTP 304 response from GET http://127.0.0.1:47015/system/:/prefs
Dec 10, 2017 02:26:25.969 [3508] DEBUG - Completed: [192.168.1.101:62917] 200 GET /:/prefs (16 live) GZIP 21ms 7764 bytes (pipelined: 3)
Dec 10, 2017 02:26:25.970 [31500] DEBUG - [com.plexapp.system] HTTP reply status 304, with 0 bytes of content.
Dec 10, 2017 02:26:25.971 [3508] DEBUG - Completed: [192.168.1.101:62918] 304 GET /system/:/prefs (16 live) GZIP 16ms 324 bytes (pipelined: 1)
Dec 10, 2017 02:26:26.028 [3509] DEBUG - Auth: authenticated user 1 as myusername
Dec 10, 2017 02:26:26.053 [31502] DEBUG - Request: [192.168.1.101:62915 (Subnet)] GET /web/common/img/backgrounds/preset-dark.64cc1c942221cd2c153244bd8ecfb67a.png (16 live) GZIP Signed-in
Dec 10, 2017 02:26:26.053 [31504] DEBUG - Request: [192.168.1.101:62918 (Subnet)] PUT /myplex/refreshReachability (16 live) GZIP Signed-in Token (myusername)
Dec 10, 2017 02:26:26.053 [31502] DEBUG - Final path: /data/user/0/com.plexapp.mediaserver.smb/Resources/Plug-ins-648bc61d4/WebClient.bundle/Contents/Resources/common/img/backgrounds/preset-dark.64cc1c942221cd2c153244bd8ecfb67a.png
Dec 10, 2017 02:26:26.053 [31502] DEBUG - Content-Length of /data/user/0/com.plexapp.mediaserver.smb/Resources/Plug-ins-648bc61d4/WebClient.bundle/Contents/Resources/common/img/backgrounds/preset-dark.64cc1c942221cd2c153244bd8ecfb67a.png is 31365.
Dec 10, 2017 02:26:26.053 [31504] DEBUG - MyPlex: Requesting reachability check.
Dec 10, 2017 02:26:26.054 [3508] DEBUG - Completed: [192.168.1.101:62915] 200 GET /web/common/img/backgrounds/preset-dark.64cc1c942221cd2c153244bd8ecfb67a.png (16 live) GZIP 1ms 31365 bytes (pipelined: 3)
Dec 10, 2017 02:26:26.058 [31504] DEBUG - HTTP requesting PUT https://plex.tv/api/servers/c69769951585c6f44117f8afe6828145dda8d04d/connectivity?X-Plex-Token=xxxxxxxxxxxxxxxxxxxx&asyncIdentifier=7ceb1d5a-22d5-484c-9acb-3f0a06097eec
Dec 10, 2017 02:26:26.292 [31504] DEBUG - HTTP 200 response from PUT https://plex.tv/api/servers/c69769951585c6f44117f8afe6828145dda8d04d/connectivity?X-Plex-Token=xxxxxxxxxxxxxxxxxxxx&asyncIdentifier=7ceb1d5a-22d5-484c-9acb-3f0a06097eec
Dec 10, 2017 02:26:26.293 [3509] DEBUG - Completed: [192.168.1.101:62918] 200 PUT /myplex/refreshReachability (16 live) GZIP 240ms 268 bytes (pipelined: 2)
Dec 10, 2017 02:26:26.325 [31501] DEBUG - Setting container serialization range to [12, 38] (total=-1)
Dec 10, 2017 02:26:26.333 [31501] DEBUG - There were 1 top-level paths for Buffy.
Dec 10, 2017 02:26:26.341 [31501] DEBUG - There were 1 top-level paths for Sons of Anarchy.
Dec 10, 2017 02:26:26.347 [31499] DEBUG - Request: [54.171.118.141:25919 (WAN)] GET /identity (17 live) Signed-in Token (myusername)
Dec 10, 2017 02:26:26.348 [31501] DEBUG - There were 1 top-level paths for Black Sails.
Dec 10, 2017 02:26:26.348 [3508] DEBUG - Completed: [54.171.118.141:25919] 200 GET /identity (17 live) 0ms 357 bytes
Dec 10, 2017 02:26:26.356 [31501] DEBUG - There were 1 top-level paths for Humans.
Dec 10, 2017 02:26:26.372 [31501] DEBUG - There were 1 top-level paths for Profiling Paris.
Dec 10, 2017 02:26:26.381 [3508] DEBUG - Completed: [192.168.1.101:62916] 200 GET /hubs/home/recentlyAdded?type=2 (17 live) GZIP Page 12-38 1211ms 9936 bytes (pipelined: 2)
Dec 10, 2017 02:26:26.427 [31507] DEBUG - EventSource: Got event [data] ‘’
Dec 10, 2017 02:26:26.427 [31507] DEBUG - PubSub: Got notified of reachability: 1 for 91.66.204.154:32410
Dec 10, 2017 02:26:26.434 [3509] DEBUG - Auth: authenticated user 1 as myusername
Dec 10, 2017 02:26:26.435 [31483] DEBUG - Request: [192.168.1.101:62916 (Subnet)] GET /myplex/account (17 live) GZIP Signed-in Token (myusername)
Dec 10, 2017 02:26:26.436 [3509] DEBUG - Completed: [192.168.1.101:62916] 200 GET /myplex/account (17 live) GZIP 1ms 755 bytes (pipelined: 3)
Dec 10, 2017 02:26:27.934 [3508] DEBUG - Auth: authenticated user 1 as myusername
Dec 10, 2017 02:26:27.934 [31500] DEBUG - Request: [192.168.1.101:62916 (Subnet)] GET /diagnostics/logs (17 live) GZIP Signed-in Token (myusername)
Dec 10, 2017 02:26:27.935 [31500] DEBUG - Diagnostics: Building logfile zip
…