DDJ SZ - Problem with strange noise

Hi,

i use the DDJ SZ a few month now and everything was fine. The last two gigs i recognized some strange loud noise after a few hours of playing.

Let me explain.. Everything is working for a few hours and suddenly music stops (actually not in the Software only the output) and a very loud noise for max about one second occurs. After that everything runs "normal" again.. after 30-45 min later the same thing happens again, and again and again... every 30-45 min. This happens with DJ Software or CD Players connected...

I was not able to reproduce this at home. Mixed for a few hours with no problems. But had the same issues in two differnt locations/clubs, because first i thought about a power issue...

Latest Firmeware is installed.

Does anyone out there have the same issues?

Thanks

Martin