Random distorted volume spike mkii

Was just using my mkii with headphones for about 3 hours straight and as i was reaching for FUNC to mute a track , i had to knock the headphones off my head. My volume spiked about 20 + DB and sounded distorted .

When i changed from pattern 1 to pattern 2 and back it was normal again.

Is there a unique key combination i could’ve accidentally pressed to make it spike instantly? (the instant volume spike combo lol)

or has someone else experienced this completely random ?

feel a little paranoid its my unit, just got it about a week ago.