The problem is that the error only occurs sometimes. I tried to shoot a video. but now it works just fine. I don't think that the problem is only the big black wheel because i don't use the big wheel when I'm on the stage. when i'm on stage I change presets only with the right Footswitch and than i go to tempo mode and sometimes the h9 turns off. and also in the last time when I rehearsed with my band it was crashed when i was pressing the Hotknob. I think it was also in tempo mode. i change with the Footswitch and the wheel only my preset list (Chorus, Tap Echo, Vintage Delay). Not more.
I hope I can record a video so you can see what I mean.