I have 2 colecovisons with the same issue. The video will freeze randomly then slowly refresh then I get normal video for a few seconds. The atari module works fine so its not RF. I have a modern power supply and the issue also occurred with original PS. One coleco I've worked on a bit, new ram, recap, new video chip, Bios. Nothing has improved the situation. Oh, the audio works perfectly and is unaffected by the video glitches