There have been sporadic complaints about audio anomalies since this unit started shipping. My B&K Ref20 pre/pro has occasional indigestion when changing channels on my HD200. Sometimes I'll get a short burst of white noise or a pop. I was going to swap out my first unit, but the replacement Sony shipped had the same problem.
This IS an issue with the HD200/HD520, and you guys are not the first to complain about it. Check out this
thread, and also the HD520
thread. I talked to Sony level 2 techs about this over a month ago; the BS you're getting about nobody else having problems is just that. I also talked to a tech at B&K, and he believes the problem is that LG was lazy in their software coding and they just didn't adhere to industry standards. Something is obviously
whacked when it takes 4-5 seconds for the receiver to start streaming DD audio after you change the channel.
On a positive note, the gentleman I spoke with at B&K thought it was quite possible to fix this with a software update. That won't happen, of course, until a number of people make a nuisance of themselves.