Yesterday on the fifth hole I hit a good tee shot, drawing a bit left near a fairway bunker. It looked like the ball bounced once in the sand and ended up over it. The fairway slopes down quickly after the bunker and can't be seen from the tee box.
Never found the ball. It wasn't in the bunker and it wasnt anywhere else, either. Weird.
Like others, sometimes I'll play an entire round with the same ball, and other times I will lose three of four. No rhyme or reason to it.