My Holy Grail Plus only works for like 20 seconds then completely shuts off! The power light is still on but the effects are NOT working. I use a Voodoo PedalPower 2 with 9v Boss-type adapters that are supposed to work for this thing (according to the pedal instructions). What do I do!? I just bought it “New” on ebay and the seller won’t take returns… I hope I didn’t just spend 120 bucks on a pedal that doesn’t work. Is this a common problem?