I have a 3510 pvr. Last week a yellow warning triangle started showing up in the lower right hand side of my tv screen. It reads: "Unsupported audio device. Please check device output". It seems to appear when I move from watching TV to the List or the Guide or if I stop watching a recording and go to live tv. It flashes quickly then disappears until I do another action with the remote (other than changing channels).
Do you know what this is?