I bought it the 2nd week it was released ATT sold me an SD card for 16 gb and they said its compatible. After 2 months it started abruptly restarting. I believe at some point I surpassed the 8gb internal storage (Zune music) which might have caused it.
But it is not just random restart, every once a while it will reset to factory settings but if I go to Settings--> about-->reset (restore default and remove all data) it will restart with all the old information and settings, this is weird and freaked me out the first time, trust me calling ATT and Samsung didn't help at all, MS only has twitter support which was not online in the night.
Anyway anyone else with this issue and know how to fix it? It is bothering me now but not annoying , but one of these day I am sure it is going to reset to factory settings in the night and the alarm wont go off.
it hasn't been a year since these phones have been out so we all still have our 1 year microsoft warranty--so bring it in to at&t and get another one. that's what i did.
my phone would restart, gradually becoming more frequent until i factory reset it; then, maybe a month reset-free, it started doing it again. i don't know if it's the memory card or what (sandisk 16gb), but something's happening.
so i got a new one. well, refurbished actually, from at&t's device center or wherever.
went into a store, explained my problem, they sent me to a device center, i explained my problem again, and they gave me a new one without question.
so now with this new phone (i kept the sd card in), i installed a bunch of apps (but kept quality in mind while doing so
, & am waiting. today is monday, i got the phone saturday evening. so far, no annoying spontaneous restarts.
maybe the cause of the problem is the SD card, maybe it's loading your crap up & the OS freaks out, maybe it's hardware. i don't know.
either way, if you're having this problem, don't take a chance & realize that your phone restarted in the middle of the night & wonder if you lost important data, get texts from what appears to be a booty call but you don't really know because you don't recognize the number, etc.
just take it in, get a new one, & pray that it doesn't happen again.
go microsoft!