This was present on the previous 8.16 beta. This is present on the Nvidia Shield Pro (could happen on other devices as well). Steps to replicate:
Navigate to an HD channel either through the EPG or “Recent Channels” list.
Let the channel play.
Press up button on remote to get to EPG
Choose another channel
Plex crashes
It leaves the tuner running in the dashboard.
If choosing the SD version of the same channel and creating the same steps as above the issue does not happen.
I am seeing this issue as well. I don’t have any SD channels to verify that scenario. However, either selecting another HD channel or even just trying to hit back to leave the guide and return to the current channel results in a crash.