Sometime lost saved changes

Hello,

I noticed couple of times that the ARmk2 is loosing saved changes between two power off (I always save my work when turning it off).
Sometime parameters of a track change, sometime it is the sequencer that lost PLock parameters.
Sometime it is both…

I wondered if any of ARmk2 user noticed the same behavior, and if there is something to do ?

It is quite annoying when you program for an hour your sequencer / design your sound an lost everything…

Thanks you