Video randomly freezing

Server is Windows 10 on 11th gen NUC Pro fed with HDhomerun Primes. Three clients, two that work properly are Fire Stick Max. The troubled one was also a Max but is now a Cube G2. The picture randomly freezes while audio keeps playing. Tapping rewind or fast forward fixes it temporarily. When I was using a Max I had to change channels to get video back. I've tried different cables, different USB adapters, different flash drives, everything. It isn't wifi because I'm wired into my LAN. It isn't my TV because the Channels interface responds. Any ideas???

You can try Settings > Playback > Advanced > Video Decoder: Software