strange sim card issue One XL

Searched for last couple hours, no avail. htc one xl evita. recently flashed 4.2.2 ruu (5.18.502) downloaded from htc sight directly. flashed just fine. phone booted up fine. it is att branded, but I am using it on straight talk with the att version sim card. this has worked just fine for couple years on my old one x that died. and worked on this one xl for a week no problem. the phone did have issues with battery level not showing correct, as it showed 99% all the time. but everything else worked fine so left it alone. after about a week tho, the phone made a strange squeak sound and shut off. rebooted no prob, but got hot fast and as it connected to network, it died again, this time battery "dead". I have done factory reset, wiped the cache, triple checked apn settings, reflashed ruu, but no help. the sim works fine in an older, 3g phone. and my one xl operates perfect without the sim. wifi is great. no battery or charging issues at all. but as soon as I put the sim in, and it connects, phone dies, as well as battery, as i have to plug it in for a few minutes to get it to reboot. every time it reboots tho, the battery goes back to showing 99% charge no matter what.
the ruu stated it was for the one x evita, but my understanding is evita is the one xl, so im assuming htc site gave me the right one. everything worked great for aweek, and now its jacked.

any help, ideas, tricks...??

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