I recently connected an antenna to my 3312 to listen to HD/FM radio and I have this strange problem where the left, and only left, channel constantly plays the FM radio at a very low volume level. It doesn't matter which function the receiver is set to, it will either begin playing immediately when you switch function (DVD, Radio, Cable, etc) or within 15 minutes, and usually between 5-10 minutes. Very annoying. I listen to music or movies at pretty high volumes (about -15dB to 0dB) and anytime there's silence between songs or in movies I can softly hear sports radio because that's what's set on the FM dial. The unit has been solid for years but I never had an antenna connected until now. Any idea what's going on? Thanks!