In my configuration (RPi5, 8GB, Ethernet, Connected via SAT>IP, Connectivity 300/50 MBit) I have problems with RPi400, RPi5 (500) running KODI 12.1 over a longer term (e.g. movie). I get artefacts on the screen - the system behaves pretty good directly after viewing, but after some minutes the first artefacts are coming (sound and graphics).
I switched down from 4KH UI to 1080 and now to 720 (but no changes). I have no real idea, where to look at ...
PS.: The environment with SAT>IP worked over the last 8 years with a Panasonic TV set without problems