I had exactly the same problem with my P8 & P9 connectors. They were clearly running too hot in places and were turning the plastic connector block a dark brown colour.
The problem is the internal blade connections within P8/P9. They seem to be too maleable for my liking and are easily displaced . The result is too much juice going through too small an area. It gets hot.
You can fix this by carefully releasing the internal connectors one at a time and making sure there's plenty of contact with the mobo pins.
You need a very thin/rigid tool to release the retaining tang on the connectors. They readily pull out of the socket with a little bit of practice. Make sure the retaining tangs are repositioned so they 'bite' when the refurbished blades are pushed back.
I've had no problems since making this little fix.
Cheers,
JaX
