I don't know if this has been discussed in this forum yet or not, but has anyone else been getting random reboots? Today my phone rebooted itself four or five times, and its rebooted at least once every day or two for the past week. Two of the times the screen turned completely blue for 5-10 seconds before it restarted. I did a factory reset and upgraded to ZV4 before installing some of my usual apps, so it's possible it could be an app just not playing nicely, but the blue screen worries me.