Oh, yah. I agree that that is one terrible problem to have!
If you are using regular thread, try waxing it to add strength (bees wax, tyers wax). Or if you're using silk ... wax it with tyers wax or cobblers wax. Or try using uni stretch for the body. I think it's a bit more durable than regular thread, or floss. There's also the standard trick of counter wrapping a fine (thin) wire over the body.
Trouts don't live in ugly places.
A friend is not who knows you the longest, but the one who came and never left your side.
Don't look back, we ain't goin' that way.