I've had my Desire for 7 months now and the issue started around March. I'm using 2.2, unrooted. The phone would just turn off by itself and wouldn't turn on unless you open the back cover and remove and place the battery back. I don't think its related to usage as the it happens even when the phone is idle. It's more horrible when you're using it. I browse often, not much into games. By the way, I haven't reset my phone to dafault factory settings, cos it didn't helped anyway according to some forums.
I've been reading forums and most likely the culprit is the motherboard. But some still confirms that replacing the MB didn't helped much. From the forums I've read, HTC on the average repairs a unit for about a 2 weeks to a month (includes shipping). I don't think I can wait that long, as I don't have a backup phone
I would like to know if any fellow CSers are having problem or had their MB replaced? How long did it take?