I am sure I read this in an earlier post but can't find much when searching. My VP50 has been fine for the last couple months but all of a sudden I seem to have an audio problem when watching any HD source. It consists of a (pretty loud) buzzing in my rear speakers when watching any HD source, which goes away completely with any SD sourcel. Not an earth problem, purely when HD processing is going on on the VP50. Anybody else had any experience and managed to get rid of it?