URL plex.tv not resolving with DNS-over-TLS

Server Version#: 1.19.1.2645 beta
Player Version#:

Everyday in the morning the remote access stops working if i enabled DoT in the new beta fritzbox firmware.
I checked the logs an in Plex Media Server.log i found those:

Apr 16, 2020 00:45:28.182 [7380] WARN - HTTP error requesting PUT https://plex.tv/api/servers/719bcd8a57329325523bf615dcd2dce2baad0311/connectivity?X-Plex-Token=xxxxxxxxxxxxxxxxxxxx&asyncIdentifier=ebc1a32f-acfe-48a2-85ab-834f1d47275d (6, Couldn't resolve host name) (Could not resolve host: plex.tv)
Apr 16, 2020 00:46:28.190 [6524] ERROR - Error issuing curl_easy_perform(handle): 6
Apr 16, 2020 00:46:28.190 [6524] WARN - HTTP error requesting PUT https://plex.tv/api/servers/719bcd8a57329325523bf615dcd2dce2baad0311/connectivity?X-Plex-Token=xxxxxxxxxxxxxxxxxxxx&asyncIdentifier=1fee07e8-684c-4335-93d3-9c2ed544cc61 (6, Couldn't resolve host name) (Could not resolve host: plex.tv)
Apr 16, 2020 00:47:12.289 [9628] ERROR - Transcoder: Failed to delete session directory (boost::filesystem::remove: Zugriff verweigert: "S:\Transcoder\Transcode\Sessions\plex-transcode-f29rducesna5irgiotp0hxe2-2906106e-a1d6-46fd-9a87-de0f2edef51a\chunk-stream0-00040.m4s")
Apr 16, 2020 00:47:28.184 [6524] ERROR - Error issuing curl_easy_perform(handle): 6
Apr 16, 2020 00:47:28.184 [6524] WARN - HTTP error requesting PUT https://plex.tv/api/servers/719bcd8a57329325523bf615dcd2dce2baad0311/connectivity?X-Plex-Token=xxxxxxxxxxxxxxxxxxxx&asyncIdentifier=fa9bbbf2-84bf-4a19-8153-8def888f65dc (6, Couldn't resolve host name) (Could not resolve host: plex.tv)
Apr 16, 2020 00:48:28.176 [6524] ERROR - Error issuing curl_easy_perform(handle): 6
Apr 16, 2020 00:48:28.176 [6524] WARN - HTTP error requesting PUT https://plex.tv/api/servers/719bcd8a57329325523bf615dcd2dce2baad0311/connectivity?X-Plex-Token=xxxxxxxxxxxxxxxxxxxx&asyncIdentifier=813fced0-b4ed-418d-ac3f-9d5f74277898 (6, Couldn't resolve host name) (Could not resolve host: plex.tv)
Apr 16, 2020 00:49:28.183 [6524] ERROR - Error issuing curl_easy_perform(handle): 6
Apr 16, 2020 00:49:28.183 [6524] WARN - HTTP error requesting PUT https://plex.tv/api/servers/719bcd8a57329325523bf615dcd2dce2baad0311/connectivity?X-Plex-Token=xxxxxxxxxxxxxxxxxxxx&asyncIdentifier=b958063c-d7a2-48cd-aa0b-e28c02c80572 (6, Couldn't resolve host name) (Could not resolve host: plex.tv)
Apr 16, 2020 00:50:15.752 [8116] ERROR - Error issuing curl_easy_perform(handle): 6
Apr 16, 2020 00:50:15.752 [8116] WARN - HTTP error requesting GET https://plex.tv/api/v2/server/access_tokens?auth_token=xxxxxxxxxxxxxxxxxxxx&includeProfiles=1&includeProviders=1 (6, Couldn't resolve host name) (Could not resolve host: plex.tv)
Apr 16, 2020 00:50:26.806 [10564] ERROR - Error issuing curl_easy_perform(handle): 6
Apr 16, 2020 00:50:26.806 [10564] WARN - HTTP error requesting GET https://plex.tv/media/providers?X-Plex-Token=xxxxxxxxxxxxxxxxxxxx (6, Couldn't resolve host name) (Could not resolve host: plex.tv)
Apr 16, 2020 00:50:26.806 [6524] ERROR - Error issuing curl_easy_perform(handle): 6
Apr 16, 2020 00:50:26.806 [6524] WARN - HTTP error requesting PUT https://plex.tv/api/servers/719bcd8a57329325523bf615dcd2dce2baad0311/connectivity?X-Plex-Token=xxxxxxxxxxxxxxxxxxxx&asyncIdentifier=c6676435-d4a5-4b00-b215-7aa85b6a53cc (6, Couldn't resolve host name) (Could not resolve host: plex.tv)
Apr 16, 2020 00:50:26.807 [10564] ERROR - Error parsing content.
Apr 16, 2020 00:50:26.811 [10564] ERROR - Error parsing XML: Error parsing file.
Apr 16, 2020 00:50:37.849 [1224] ERROR - Error issuing curl_easy_perform(handle): 6
Apr 16, 2020 00:50:37.849 [1224] WARN - HTTP error requesting GET https://plex.tv/media/providers?X-Plex-Token=xxxxxxxxxxxxxxxxxxxx (6, Couldn't resolve host name) (Could not resolve host: plex.tv)
Apr 16, 2020 00:50:37.849 [1224] ERROR - Error parsing content.
Apr 16, 2020 00:50:37.849 [1224] ERROR - Error parsing XML: Error parsing file.
Apr 16, 2020 00:51:28.180 [6524] ERROR - Error issuing curl_easy_perform(handle): 6
Apr 16, 2020 00:51:28.180 [6524] WARN - HTTP error requesting PUT https://plex.tv/api/servers/719bcd8a57329325523bf615dcd2dce2baad0311/connectivity?X-Plex-Token=xxxxxxxxxxxxxxxxxxxx&asyncIdentifier=63f635eb-7464-4791-9c81-689cfd2bfaed (6, Couldn't resolve host name) (Could not resolve host: plex.tv)
Apr 16, 2020 00:52:28.184 [6524] ERROR - Error issuing curl_easy_perform(handle): 6
Apr 16, 2020 00:52:28.184 [6524] WARN - HTTP error requesting PUT https://plex.tv/api/servers/719bcd8a57329325523bf615dcd2dce2baad0311/connectivity?X-Plex-Token=xxxxxxxxxxxxxxxxxxxx&asyncIdentifier=fa726b9d-008c-4971-a1f1-0864cd20496d (6, Couldn't resolve host name) (Could not resolve host: plex.tv)
Apr 16, 2020 00:53:28.181 [6524] ERROR - Error issuing curl_easy_perform(handle): 6
Apr 16, 2020 00:53:28.181 [6524] WARN - HTTP error requesting PUT https://plex.tv/api/servers/719bcd8a57329325523bf615dcd2dce2baad0311/connectivity?X-Plex-Token=xxxxxxxxxxxxxxxxxxxx&asyncIdentifier=16c7c4a2-aecf-4cb5-ac73-66c484fd4437 (6, Couldn't resolve host name) (Could not resolve host: plex.tv)
Apr 16, 2020 00:54:28.183 [6524] ERROR - Error issuing curl_easy_perform(handle): 6
Apr 16, 2020 00:54:28.183 [6524] WARN - HTTP error requesting PUT https://plex.tv/api/servers/719bcd8a57329325523bf615dcd2dce2baad0311/connectivity?X-Plex-Token=xxxxxxxxxxxxxxxxxxxx&asyncIdentifier=bcf8d4af-1c48-460d-970d-f5d0811ae196 (6, Couldn't resolve host name) (Could not resolve host: plex.tv)
Apr 16, 2020 00:55:28.183 [6524] ERROR - Error issuing curl_easy_perform(handle): 6
Apr 16, 2020 00:55:28.183 [6524] WARN - HTTP error requesting PUT https://plex.tv/api/servers/719bcd8a57329325523bf615dcd2dce2baad0311/connectivity?X-Plex-Token=xxxxxxxxxxxxxxxxxxxx&asyncIdentifier=9858ba0a-e597-4e48-a617-10e296c0c2be (6, Couldn't resolve host name) (Could not resolve host: plex.tv)
Apr 16, 2020 00:56:28.184 [6524] ERROR - Error issuing curl_easy_perform(handle): 6
Apr 16, 2020 00:56:28.184 [6524] WARN - HTTP error requesting PUT https://plex.tv/api/servers/719bcd8a57329325523bf615dcd2dce2baad0311/connectivity?X-Plex-Token=xxxxxxxxxxxxxxxxxxxx&asyncIdentifier=4de64739-ea7c-426b-9a3e-506e018cc669 (6, Couldn't resolve host name) (Could not resolve host: plex.tv)
Apr 16, 2020 00:57:28.184 [6524] ERROR - Error issuing curl_easy_perform(handle): 6
Apr 16, 2020 00:57:28.184 [6524] WARN - HTTP error requesting PUT https://plex.tv/api/servers/719bcd8a57329325523bf615dcd2dce2baad0311/connectivity?X-Plex-Token=xxxxxxxxxxxxxxxxxxxx&asyncIdentifier=f4030cc8-678c-4082-8c62-a8644558875f (6, Couldn't resolve host name) (Could not resolve host: plex.tv)
Apr 16, 2020 00:58:28.181 [6524] ERROR - Error issuing curl_easy_perform(handle): 6
Apr 16, 2020 00:58:28.181 [6524] WARN - HTTP error requesting PUT https://plex.tv/api/servers/719bcd8a57329325523bf615dcd2dce2baad0311/connectivity?X-Plex-Token=xxxxxxxxxxxxxxxxxxxx&asyncIdentifier=af153942-36e3-466a-9b7b-6de7cd62c961 (6, Couldn't resolve host name) (Could not resolve host: plex.tv)
Apr 16, 2020 00:59:28.182 [6524] ERROR - Error issuing curl_easy_perform(handle): 6
Apr 16, 2020 00:59:28.182 [6524] WARN - HTTP error requesting PUT https://plex.tv/api/servers/719bcd8a57329325523bf615dcd2dce2baad0311/connectivity?X-Plex-Token=xxxxxxxxxxxxxxxxxxxx&asyncIdentifier=33101d76-3cad-4970-839d-e83bea825a5d (6, Couldn't resolve host name) (Could not resolve host: plex.tv)
Apr 16, 2020 01:00:28.180 [6524] ERROR - Error issuing curl_easy_perform(handle): 6
Apr 16, 2020 01:00:28.181 [6524] WARN - HTTP error requesting PUT https://plex.tv/api/servers/719bcd8a57329325523bf615dcd2dce2baad0311/connectivity?X-Plex-Token=xxxxxxxxxxxxxxxxxxxx&asyncIdentifier=ec87e164-23d9-44ac-be4e-46387abc5b4c (6, Couldn't resolve host name) (Could not resolve host: plex.tv)
Apr 16, 2020 01:00:28.181 [2040] ERROR - Error issuing curl_easy_perform(handle): 6
Apr 16, 2020 01:00:28.181 [2040] WARN - HTTP error requesting GET https://plex.tv/api/v2/server/access_tokens?auth_token=xxxxxxxxxxxxxxxxxxxx&includeProfiles=1&includeProviders=1 (6, Couldn't resolve host name) (Could not resolve host: plex.tv)
Apr 16, 2020 01:00:39.234 [10564] ERROR - Error issuing curl_easy_perform(handle): 6
Apr 16, 2020 01:00:39.234 [10564] WARN - HTTP error requesting GET https://plex.tv/media/providers?X-Plex-Token=xxxxxxxxxxxxxxxxxxxx (6, Couldn't resolve host name) (Could not resolve host: plex.tv)
Apr 16, 2020 01:00:39.234 [10564] ERROR - Error parsing content.

My guess is, its an old curl version used by PMS which does not support DoT.
I tried cloudflare and google DoT.

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