HELP.....Traktor pitch/grounding issues

Please someone help before I throw traktor and my equipment out the window.
The pitch of the track fluctuates up and down and eventually the tune starts to distort and then bad grounding flashes up on the laptop.....I'm using traktor scratch A6, 2 x numark ttxusb, allan & heath xone92 and my laptop is a dell with i5 processor.
Any advice would be appreciated!!!!!!!!!!:cursing:

What version of traktor are you using? And are you using the correct vinyls? Need more information if we are to help you.

Hello swift, thanks for replying.....I'm currently using traktor scratch pro 2 (version 2.6.5.250) with mk2 black vinyls.