tried a few different power supplies, will not power. sometimes will power up when plugged into a wall outlet, but not a power strip. Sometimes powers up when there’s no sd card inserted. Tried using a power brick, to power multiple stomp boxes, and is intermittent. Don’t have this problem with any other 9 volt stomp box devices.

Given your experiences, I’d guess that’s an intermittent connector in the pedal. Unless someone’s thinks otherwise, I’d recommend you contact support.