I sent in the diagnostics log.
I'm running the DVR on a PC and using a 4K Firestick for the client. The channels app crashes around the 33 minutes mark of October Kiss (recorded on the Hallmark Channel using a Prime). Before the client crashes the screen goes dark but so does the commercial break. The file plays fine on VLC. It's not the first time that the client choked on a Hallmark Channel recording.
Do you need anymore information?