RB and LB bumpers not working

Hey there, I just got the Ally Z1e for Christmas and my bumper buttons do not work right. I first noticed it ingame and then did some testing on gamepadtester. First it was only RB, now that has seemed to fix itself but now LB ist the problem. They only register like 50% of the presses and sometimes dont work at all for some time.
For now Ive sent out a support message to ASUS explaining my problem but I thought maybe you guys could help me too.
I tried googling and looking for problems in this reddit but all I could find was driver or bios updates (which I just checked again) and some dislocated rubber (which I also checked).
I would appreciate any help! Happy new year to everyone.