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I love this board, 'tho the biggest problem is keeping up with all the posts relevant to my phone.
I'm happy to know I'm not alone with the rebooting issue: mine didn't work well at all in the Southwest, starting with low signals in Albuquerque with GPS, to not working virtually at all in Las Vegas. To use camera, etc., I had to go into Airplane Mode. And it rebooted last night while using Google Search, so I'll be aware of the heat warning.
I still love the silly thing: it's coming up on one year, and I'd hate to even think about changing. Sprint's been good to me and I've had really helpful service from them with plans, phones, and service/help.
MM
There's a link inside here to fix Sense force-closing - http://androidforums.com/evo-4g-support-troubleshooting/141369-how-fix-froyo.html
If that fails, factory reset the phone.

I haven't experienced the dreaded reboot in a while, until this past weekend. I was using google navigation and then received a phone call. In the middle of the call, reboot! This random reboot issue needs to be addressed, but looks like it's too random for HTC to figure out.
This is what is happening to me. I first started noticing it happening to me about a month ago.. with the mobile data on and GPS. My EVO would reboot by itself. Now I notice that it seems to reboot and constantly reboot (on a cycle) when the phone is warm or hot.That's the way mine started out and then it progressed to when the phone got hot it did it consistently. I ultimately had to replace the phone.

My wife and I have both been having this issue for quite some time (2+ months for me, and 4+ months for my wife.) We went into the Sprint store last night and after the tech spent an hour w/ our phones he said he had them fixed and they wouldn't loop anymore. I asked what the problem was and he said that my cache needed cleaned (which I had done several times recently) and my wife's needed another update (which she had already done.) I told him I'd be sure to ask for him when our phones had the problem again. Within one minute in the parking lot both of our phones were boot looping again. We had to order new phones (at our expense of course.)
I don't care if this is a Sprint or HTC problem, someone better step up or we'll be going elsewhere.