pad bank problem

hey,

i have problems with my mpc. when i switch the pad banks, there is always light on two banks, like on A and D or B and C. Also I have to press the A button to change into A-bank for a couple of times until it works. Is this a known problem? How do I fix it?

Thanks..

(btw, i have the akai os)

also TR+ and TR- does not work properly