OP-Z pops (only) over headphone out

[FunkyJunky]

there are similar topics already on this forum :

OP-Z audio issues

I made some new kits with op1 drum utility and when loaded my user samples all had clicks and pops. Having just upgraded fw I downgraded, factory resetted and upgraded fw again. Clicks and pops were still there. ??? I was fearing an HW issue reading the posts here, but my metronome, factory samples and so on were sounding with no issues. I then just used another USB port on my laptop and finally it worked as usual. The port giving me problems is one that charge even if the PC is …