Hi I have a S7 batch 6  and its giving me a lot of grief every thing works like it should but then it starts mining oddly, ie  random, no hardware errors .02%  have power monitors on them so its not power, I was wondering if the firmware might need to be updated and what exactly is the correct firmware? I want to be sure before i do anything. in the bitmain site there are several updates but which is for the batch 6.  I have put new fans on, the voltage, and oc is stock.  checked every thing?  any ideas.

thanks