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One thing I remember from testing arcade boards is that the digitizer chip randomly reported completely incorrect line counts / timings (even when its output was perfectly stable), triggering OSSC to change processing mode until I added some filtering logic. I’m not sure if this could be related to the same issue, but it can be easily checked by temporarily freezing OSSC’s mode detection logic. Once sync is stable, the easiest method to do that is pressing profile load hotkey on remote but not select any. There OSSC polls for user input and does not query the digitizer chip on (potentially false) mode changes.