According to a member of Eventide’s H90 Facebook users group, Dan at GigRig said there’s an older version of the SuperNova that only put out 500mA. The news ones put out 1000mA. You may have an older unit. Only way to find out is to open it up and see. Here’s a link to the post where they confirmed buying a new one solved the problem.

https://www.facebook.com/groups/h90users/permalink/463817555919715/?mibextid=W9rl1R