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The MMU2's electronics board has a +5v design flaw. This shows itself in intermittent selector or idler movement failures. Sometimes I can jiggle the power and signal wires and that fixes it, but more recently I just connect a 5v power supply to the MMU's usb as others suggest, and that seems to fix the issue. Following their GitHub, it looks like they might have fixed this in software, but that software STILL hasn't been released and for the amount of grief this has caused....shiiiii.....The MMU3 better have a new board is all I'm saying.
Restarts during printing happen due to the low voltage issue. Grab usb phone charger brick, plug it into the wall, and then connect the MMU's usb port to the charging brick. It'll supply enough current to overcome the low voltage issues, and should prevent restarts. Additionally, try installing TZB firmware on both the MMU and the printer - it seems to be more resilient against the voltage issues.