I have had a new Bravia for all of five weeks.  Its been working perfectly.  I love it.  Then tonight it just switched itsself off. I turned it on and it lasted thirty seconds before flicking itself off and then back on and then off.....

Its connected to a Sky Box but its not making any difference whether I switch it on with the remote or manually.  It just turns itself off again.

Anyone experienced this?

Thank you.