DJM- S9. Channel 2 is jumping from Relative to Internal mode at random

 I've optimized my laptop. Updated firmware & driver. I even replaced rca's and internally grounded my turntables... when all these things didnt resolve the issue, i took it into pioneer tech service (George Meyer) to determine weather my problem is hardware or software related. Their diagnosis was something is wrong with the Main Control Assy... 

Since they determined that its the actual hardware itself, i was able to exchange it for a new one. BUT the problem still persists with new unit.