Minibrute tuning problem

[deathmasks]

My minibrute seems to lose temperament and go out of tune with itself when I turn up the volume. For example G4 sounds sharp in relation to C4 when the volume is turned up. Interestingly, if I turn up the volume on an external amplifier this problem persists as well. If I keep the volume at or below roughly halfway the keyboard seems in tune. I can see this becoming a problem if I want to play live with the synthesizer.
Does anyone have any ideas what the cause of this could be?

[Germain.arturia]

Hi deathmasks,
i am looking at your issue, and would like to know if the problem persists when the brute is warmed ( after 10-15 minutes normally).
Could you please tell me more about your parameters used, or even post a picture please?
like that i can reproduce the situation, and then help you.

best regards,
Germain - Arturia test team