As of 2 days ago I have/had _exactly_ the same problem with the same tv 32dw9625/05r.
I found (I don't recommend this if you don't know what you're doing) it's a dry joint or bad connection on a 3 wire lead that runs from the circuit board at the top above the tube to the middle of the back of the 'base' circuit board.
I left it off to discharge a while and diceconnected and reconnected this and it's been fine since (2 days).
However I haven't replaced the tv cover yet so it may be heat related as well. But I know touching the lower end of that connector with a screwdriver fixed it temporarily (for a minute or so) and reconnecting looks like it's helped...
Report back if you have any luck :) - but be careful - huge voltages in the backs of tvs(!!).
Kev
Kev
April 2008