my op-1 turns itself on while the switch is off


I have noticed that when I try to use my op-1 after not using if for more than a week, it doesn’t turn on (battery dead). Quite surprising, considering that the op-1 can play like 15 hours in a row.
But today, I might have found the reason why. I’ve noticed that my op-1 turns itself on and off while the switch is set at off. When it happens, it doesn’t load the internal program, it just stays at the initial black page with some error codes.

Is that a common issue? If so, can it be fixed?
Otherwise, it’s not good for the battery’s longevity, and it’s pretty annoying too.