In the 8 months that I've had this phone it has shut off randomly 3 times (fully charged, not that many programs were running to make it crash, etc...). The only way to turn it on again is to take the battery out, put it back in and turn on the phone. I haven't abused it really (it has kamikazed itself to the floor on occasion). Has anyone else experienced this? Is there anything that can be done to prevent it?