-One instance -No changes to the config -I'm the only person with access -No major outages at the time
It went down, and the AWS monitor didn't actually see it go down until 45 minutes later, which it needs to be down for a certain amount of time before their techs will take a look.
It was my first time using AWS, and I didn't want to risk waiting for tech so I rebooted the instance and it started back up again. I have no idea why, but it failed with out reason, and on reboot worked like it always did.
My point is that AWS has been solid, but they are like anything else, there are tradeoff's in using their service, and they aren't perfect.