I don't have any recommendations for that symptom. I would have recommended having the unit inspected as well.
It started out making noise for only 30 secs or so but now the noise lasts for 45 minutes until it mostly goes away. Once in a while the volume will disappear completely also. This happens w/satellite, dvd, games...everything. I emailed Samsung and they gave me the typical "call a repair center". I would like to try to figure this out first before I spend $100 for them to tell me there is nothing they can do or if it is really worth the repair. Please help, its getting really annoying!