My last HTC phone (Android) rebooted about 6-15 times p/year. I have never found out why, but honestly it was not a major issue for me. My new HTC 8x has not rebooted yet, although it would not surprise me if it reboots one day. Anyway most people I know, who have HTC phones have sometimes reboot problems, but then again the Samsung Galaxy of my husband also sometimes fails and I also had to go with my daughter to a phone store to get her iPhone 4s restarted. It seems that no phone is perfect 
