I have a fairly new Boss ME 70 that I purchased from a reputable seller on ebay recently. Sometimes when I am playing the digital display flickers between the numbers 1 and 2 and my volume almost completely cuts out. I have reset the unit to the factory settings but it is still happening. Can't take it to a gig until I figure this out or get it fixed. Any ideas?

Music - Boss - ME-70 Guitar Multiple Effects Pedal