Does anyone else expereince this problem or know any resolution? We have a Sony KP41DS1 tv for about 2 years, and ever since we have had it, when changing digital channels you have about a 1 in 4 chance of the tv beeping really loudly (sounds a bit like a phone ringing) then the channel kicking in, but with no sound, at this stage the sound is completely gone even if you go to another channel, the only way to resolve this is to switch it off and back on. Also intermitantly the coloured buttons which also do the sound settings or settings such as brightness for example do nothing. I presume this is a inherant software design problem, I have not contacted Sony yet, the guarentee has run out, but we bought the retailers warranty insurance thing over 5 years, so may be able to get something done on that? Any ideas ?????? Thanks..