This is happening to me as well.
I also see some curl failures in the logs going to plex.tv, it’s been happening since the last few days. My server will stay logged in and then decide to log itself out.
Mar 08, 2018 13:13:34.132 [0x7fb2d4bff700] DEBUG - HTTP requesting POST https://plex.tv/api/claim/exchange?token=xxxxxxxxxxxxxxxxxxxx4cpLJv
Mar 08, 2018 13:13:34.134 [0x7fb2d4bff700] ERROR - Error issuing curl_easy_perform(handle): 7
Mar 08, 2018 13:13:34.134 [0x7fb2d4bff700] WARN - HTTP error requesting POST https://plex.tv/api/claim/exchange?token=xxxxxxxxxxxxxxxxxxxx4cpLJv (0, No error) (Failed connect to plex.tv:443; Connection refused)
Mar 08, 2018 13:13:34.135 [0x7fb2d4bff700] DEBUG - MyPlex: Did token exchange for claim (returnCode: -7)
Mar 08, 2018 13:13:34.135 [0x7fb2d4bff700] DEBUG - MyPlex: Got a token poked, let's act on it.
Mar 08, 2018 13:13:34.135 [0x7fb2d4bff700] DEBUG - Need to restart some processes because of a change to the security environment.
Mar 08, 2018 13:13:34.135 [0x7fb2d4bff700] DEBUG - HTTP requesting GET https://plex.tv/api/v2/release_channels?X-Plex-Token=
Mar 08, 2018 13:13:34.137 [0x7fb2d4bff700] ERROR - Error issuing curl_easy_perform(handle): 7
I am running plexmediaserver-1.12.0.4829-6de959918.x86_64 however I also downgraded to each version prior to that.
