Weird pitch shift issue

Hey so I kind of have a reoccuring issue that I breifly mentioned in this thread (Weird signal bleeding issue) where if I play all four notes on my polyphonic modular synth, they would all detune or not even really register as notes. I thought I fixed the problem several times changing wallwart adapters, cables, power strips, a lot of variables but still get the same issue if not worse now. I think I read somewhere about it could be a current draw issue, but if it comes and goes here and there, I’m not exactly sure what it can be. Has anyone experienced this sort of problem and can maybe give some advice if any?