[Jon Stratis]

I would start by removing all PWM's to the Victors - does the problem still happen with all motors? Or does that limit it to just some? If it limits the problem, replace the affected victor(s) and give it another try.

If it still happens with all the victors... try looking for a short somewhere. Check the power going into the victor and make sure you see appropriate +12V - it's possible you have a short that's feeding in reverse polarity (maybe attached to a motor, so it only shorts when the motor is in a specific position), which would cause funky issues and probably wreck the victors.

Try pulling the breakers to all but 1 motor controller - can you get that controller to behave properly? If so, add breakers back one at a time until things go funky - that'll tell you which power pathway/victor/motor is causing the issue.

If unplugging the PWM's fixes the problem for all victors, I would replace the digital side car and try again. It's possible there's some metal shavings in there that are giving an intermittent contact on the PWM control wires, or one of the chips may have gone bad/burned out to cause funky behavior.

When dealing with odd situations like this that appear to be system-wide, it's usually best to break the system down to its simplest form and then start adding features/parts back on - that way you can start from a position you know is working and find the area that is actually causing the problem.