i was watching channel 281 tonight 1/1/06,all of a sudden 281 switch to another channel,but staying on channel 281,now every time i go to 281 it makes that clicking sound,like when you go from the hd channel to the regular channel,when i switch now to a hd channel it will not make the clicking sound only on 281,is there a update going on or this is a bug,my other 505 is not doing that,the other channel it makes that click switch is 298,299 and 300