ddj-sz

hi there I recently purchased a second half ddj-sz, it was working fine for a couple of weeks then out of nowhere it was like a midi bug where I couldn't use the headphones cue or tempo slider not working and several other I've tried hard reset installing drivers firmware etc to no avail. then 1time it started working again and I got 1day mixing out of it b4 it went again but this time I can't fix it. its the same issue on mac monterrey and Windows 10 I'm hoping someone can shed some light on this thanks.