FMG, You are definitely not the only one. I stopped using my N900 as alarm after that happened me twice. It didn't alarm and I missed 2 hours school. Now if you miss 1 lesson you need to come back twice the amount you missed, so I wasted 4 hours of my life :P

Also while you RE'ing it, would it be possible to only stop ringing after some reaction, not at the end of the song. -.-