DJM-S9 Double Audio Issue

 Hello, for the last month I been having an audio issue the the S9. about an hour into Djing I will get what sounds like two of the same song playing about a second off from each other. This lasts for about 10 seconds. I have tried 2 different laptops and this has happened on both. I have tried Serato and Rekordbox and it happens on both. I have checked the FX section on the mixer while this happens which the FX are off and the gain is turned all the way down. I have no clue is going on. Please Help!

Thank you

Javi