u/AurumNiger

So I got 2 behringer 2600s..

The other one drifts from tune sometimes suddenly. After 30mins its way off. I allways do tuning before playing. Ive done calibration many times with trim pots and it still does this. It has to be tuned between songs and its frustrating. I did live sets but now it does not feel good due to this issue.

But the other one stays allways tuned. No need to "warm up" etc. No matter what. It just works and the tuning is where I left it.

Malfunctioning unit? No warranty. Any ideas? Have I messed up with the trim pots for good?