Process of elimination, tracking it down, are you "ONLY" hooked up to one Sat. (91) or are there still others (110,119) hooked up as well. Suggest ONLY Setup on one Sat. say (91) no switches, etc. in the equation (single cable) direct to T5, run for a while as is
no (usb/pvr, plugged in) see if acts up, then get a small 4-8gb USB Stick/thumb-drive for PVR, Try it and see if acts up etc.
You have to TAKE One Step at a time, and track down what is causing your issue/problem.
I still believe it is a power issue (power adapter,board,caps,etc.) but you will have to find it.