DDJ FLX10 goes to sleep while playing

Hi, I do an internet show and before going live I play like a 2 hour video set... then I go live and almost every single time about 90 minutes after I start the whole controller goes dark or asleep! The info in the middle of the jog wheels goes away and turns black no affects work no stems no delay... and I press every button on the controller and it just will not wake up... I can only cue a track and play them... FYI I use virtual dj and I have had in the past the sz and sz2 and the srt-1000 and not one of these ever did this. Any thoughts would be appreciated. Thanks in advance for your time and thoughts...