I appear to be seeing the same issue, also talked about here https://forums.plex.tv/t/playback-error-and-tuner-service-hang-when-changing-to-new-channel-in-live-tv-dvr-tuner-segmentation-violation/737623 the thread started did post logs.
While i am waiting for this issue to pop up again to retrieve logs, i can tell you my plex server is on ubuntu 20.04 with plex server version 1.24.0.4930. I am also using the Hauppauge WinTV-quadHD. I can also say the failing to tune issue seems to be regardless of player type or version, as if the problem happens i cannot tune from my iphone, windows desktop app, or web app.
