I have an old Sony KV29FXU (I think) and it has started to switch itself off for no reason. The screen will go black with a red squiggle on top and switch off. The led underneath will flash on/off twice then repeat and I have to switch it off manually as the remote does nothing. Does this sound like my tube is going or maybe the red part of the gun is dodgy? I'm going to call Sony and ask for advice (it's over 5 years old so no guarantee) but was just curious to see whether this has happened to anyone else?