For the past several days I have been noticing that while performing certain functions such as pause, slow motion, and other DVR related functions, I occasionally get a very loud high-pitched noise.
I get the same thing through my TV speakers when resuming from pause on my Hopper 3. It has been happening for at least a few months now. I don't have a Sony though, so it doesn't seem to be limited to that. I run through an OPPO blu-ray player to a Panasonic TV.