I posted this on February 1st, and no one got back to me.
A simple search online has shown me that I'm definitely not the only one who has experienced this issue with this same phone. I got the Amaze 4G for Christmas, and shortly after getting it, I noticed that I'd go to wake it from sleeping, and it would be non-responsive. After repeated attempts to turn it on, the device finally lit up with the lock screen for a split second - then it would reset, and the white screen with the Android icon would show up. This happened almost once every day for a good while. On the 17th of January, I dropped that phone down two flights of stairs, and effectively shattered the screen. It still functioned, as the LCD was still functional, and I was able to use - albeit awkwardly - until the replacement came in the mail. The random reset problem persisted. I finally switched to the new one this past Sunday. And guess what? Same problem. As a matter of fact, it just happened again 15 minutes ago, which is why I finally decided to voice my frustration. No, it's not a huge deal, but you would think HTC would get on this kind of problem right away. Obviously it's an issue with the phone, because it certainly isn't an issue with how it's being used. This is TWO PHONES of the same model now that have been doing this for me.
After every reset, it asks if I want to send a system report to HTC, and I'm always sure to, along with my location. Not that it really makes any difference - it's still happening EVERY DAY.
And while I'm here, I might as well mention that I too have experienced duplicate messages every so often. And guess what? It happened with the OTHER phone too! Whoa! No way!! I'm using the standard messaging app, nothing special.
As little of an aggravator as this is, I find it rather disappointing that this is very clearly an issue with the phone itself, and that it's not really a unique thing I'm experiencing. This is one of the most expensive phones you can buy through T-Mobile. I can't even begin to tell you how badly I wanted this phone for Christmas. I switched to this from a Blackberry Curve 8900. Awesome phone (aside from the infamous trackpad issue, which I figured out how to get past with ease). But I can't tell you how high I held HTC - it's why I wanted this phone so bad. So why is it that this phone - HTC's most expensive phone through T-Mobile - comes with BUILT-IN issues?
Yes, I have taken the battery out and put it back in. Plenty of times. I don't feel like that even matters here, though. This phone started doing this right out of the box.