When plugging in the power supply, on some occasions,the display screen and l.e.d lights,will illuminate Simultaneously. When I do get to the main screen, while playing with a effect; the looper setting will turn on by itself and vice versa from looper mode to effect select scene. If I'm using the tuner, scrolling through the menu it can/will switch to looper mode . It's as if the tap tempo and one shot buttons are staying down by themselves. Your thoughts?