My droid phone randomly will shut off when it is not in use. Yesterday the phone powered off three times. Last night I set the phone on the island like I do every night, in the morning the phone was turned off. When I turn it back on the power indicator has showed green on all occasions. I was traveling on Wednesday and using the gps with the phone plugged into the charger. About 3 hours into my trip I went to look at the map and the phone had shut off?