Update...
It was at the menders for 7 weeks

taking the p*** if you ask me... all through the world cup
Finally got it back 2 weeks ago.. the switching off seems to be cured... and the widescreen mode acts as it ought to.. but..
When watching feeds from Freeview or DVD, if the picture is very dark on left hand side, then get central area bending in slightly, like the side of a plate coming into the screen, about 1/2" maximum. When the pictiure is bright then dont see this problem. Also there is slight vertical lines on LHS almost like analogue reception, but this is when watching DVD!
Not very happy - putting up with it for now... but warranty has aboout 9 months to run. Really dont want to send it back for third time and want a new TV. Debating how to make it unfixable when I get fed up with it... then put money towards something nice.