Menu dims and disappears

I have my beat buddy all set up and it works great. But here’s a new one - I’m running a 9v 500mA dedicated line into the BB but when I try to get to the menu the display dims and goes away. Then when I want to start playing again it pops right back into action. But I can’t get into the menu. Any ideas what’s happening here?

If it doesn’t do it with the PSU that comes with your BeatBuddy (BB) pedal, it could be your non-Singular Sound power supply.