ProKeys Sono 88 Update + cracky noise + random notes...

Hi,

I spent about an hour to read this forum and I haven't found what i'm looking for. I have exactly the same problem that this guy : http://forums.m-audio.com/showthread...-1-0-2-FAILS-(

1) The keyboard is connected directly to the rear USB connectors of the PC.
2) I've tried to use differents drivers on Windows 7 (obviously including the last one).
3) I've tried to install these drivers on differents OS : XP SP3 x32 and Win7 SP1 x64.

I absolutly want to update the firmware because the keyboard play random notes or chords with cracky noise at full volume with sustain at random times when I play...

It's very irritating...

Can someone help me ? Do I need to return the keyboard or is there a solution ?

Thanks.