I have an 21″ LCD tv with freeview. Unfortunately although picture quality starts great, starts to scramble and freeze, same with the volume after 5mins if lucky. Has anyone else had this problem and been able to sort out?

Any help/information would be greatly received.

Hey guys i have a 32inch LG LCD TV and i am wondering will it lose picture quality , sharpness , contrast or colors overtime or will it stay the same forever ? plz i need an answer this is very important. Thanks in advance

I have a Sharp LCD TV and just recently when I switch the TV on, no picture comes up, only sound, the screen is completely blank. I have found that if I switch the TV off at the mains and leave it for a few seconds, when I turn the TV back on, the TV picture is there, but now it is gradually getting worse and it takes more than 2 or 3 attempts at doing this to finally get a picture on the TV.
Does anyone know what might be the problem here? Please help!
My TV is less than 2 years old