Answers to your questions:
1. The TV is 5 1/2 years old
2. Nothing has ever been done to it, no work at all
3. Yes, all looks and sounds okay when it works
This just started a few days ago; had happened about three times now. The screen goes blank and sound goes off, for approximately 30 to 60 seconds, then comes back on.
Yes, I need a copy of the manual...can't find the original. Please send it to XXXXX@XXXXXX.XXX...thanks.