My Edge 305 is having an issue. Recently it would shut off automatically in the middle of a bumpy ride,especially on the rigid Vicious Monolith. It happened several times. It restarted fine every time. I contacted Garmin today via email, will see how they say about it.
BTW the new Garmin Connect doesn't like my 305. I cannot upload any long rides. The browser just hangs.
Update Monday 8/24: Garmin replied the issue is covered by warranty. I'll send it back after the SM100.