I updated yesterday to the latest firmware that was available and straight away found a number of issues. The device wouldn't hibernate properly anymore, the battery percentage went from around 28% to 50% after the update which seemed odd, and then after this the battery drained alot faster than normal and ran down to empty. I hit the power button which usually displays the battery with the cross through it symbol, nothing. Plugged it into charge and left it overnight, still nothing. Either its not charging anymore or its just not powering on for some other reason but I now have an expensive paper weight! Has anyone else had this problem? I'll get in contact with Microsoft but just wanted to warn anyone that hasn't already updated, stay clear of it!