rpi crash

[networkpadawan]

(don't know if this is the best section, if not, can a mod please move it?)

Hi, yesterday I instaled a fresh beta 1.1, (before I had raspbian + xbmc package) and now every 10 minutes the rpi/xbmc becomes unresponsive. no ssh / no cec on the screen, nothing. Does anyone knows where should I start looking? any log? Its a fresh xbian beta1.1 with 2 custom packages brige-utils and hostapd. oc'ed to medium. thanks in advance.