A previous poster mentioned this issue and I'm having the very same thing happen to me (I would've replied in that thread but the site was not letting me do that for some reason...and it could be user error). Twice since 11 a.m. today after I activated the phone the Moto X has powered down on its own. The latest time the battery was at 53% so I don't think it's attributable to that. Growing increasingly frustrated. Any ideas...suggestions? Thanks in advance.