XDJ-RX2 Multiple Strange behaviour any recommendations?

I have a XDJ-RX2 which from one day to next shows multiple strange behaviours.
For example:

-when starting up the Deck 2 REV and Slip button are illuminated(which it never did before)

-when I load a track it keeps fast forwarding through all tracks

-when I turn it off, the Deck 1 jogwheel is illuminated, and the buttons in the top bar (like Menu and Tag List) are still illuminated

-it shows a sound level without something playing

-when I try to enter Firmware Update mode nothing happens

-sometime after starting it shows an USB stick error message, without a stick being in the slot

And a ton more failures. I checked all buttons, if maybe one is stuck. Couldn't find one.
Any ideas how to fix his by myself?

Thanks!