DDJ SRT 1000 MICROPHONE STATIC

Hello,

I'm sorry if I am not asking this question in the correct place.  I did try searching first.  

My DDJ SRT 1000 produces a loud static sound when I turn the "mic" switch on. This happens without a microphone hooked up. It happens without Serato Pro hooked up. If I turn on the controller and turn on the mic, I get nothing but static.  This began yesterday.  The unit is almost 2 years old.  Channels 1-4 work fine.  No issues.  Any help would be appreciated.  Thanks!