Own the RM-985 variant (Telus) and although I've haven't had any random reboots whilst phone has been idle, as far as I'm aware, there are instances where the phone reboots when using an app, so far it has been WC, Fantasies Painter and Office. Did a factory reset yesterday but encountered another reboot today, that's a total of six in 7 weeks of owning the phone. Have only had 3 in two years of owning my Ativ S and none so far with my year old 1020 (knock on wood). Got to say I'm a tad disappointed with the 830 to a degree because of this and hoping an update will resolve, would hate to have to send away for repair as we all know that ain't going to be a rapid affair and no guarantee the end results will be positive... Been there, done that so speaking from experience.