Same here. Even after a replacement (new one) Back to Factory settings is no solution, done it 5 times now (by 8 times i know what the 8x means). A piece of tape is no solution....Even now with the factory settings restored for 10 minutes, the phone is rebooting in a 5 minutes sequence. HTC is responding: send for repair, so no phone for more than 10 days, and probably a restored to factory settings solution. HTC says further: by 3 times repair tries, you will get a new one....So i will have to wait for a long time. many forums are discussing this issue and many people are complaining that HTC is not fixing the problem: you get a rebooting phone back after 10 days.
I am desparete! Im am recommending no one this phone, or even this operating system: windows phone! This issue is around on the net for more than 1/2 year, and still no fix.
So people: accept that you being conned by verry big and untransparent companies.
Stil i have hope that there is comming a solution, otherwise they have stolen 300 euro's with big talk.