Windows 8 Randomly Reboots With Clean Desktop

When you boot up your computer and log in to your Windows 8, you'll usually see your typical start screen full of icons, like mine.

With your wallpapers, shortcuts and everything, that's fine.

Here's my problem, it was only happening once per 10-15 log in to Windows 8, but now it's happening more frequently, when I key in my passcode and the loading begins, it changes to 'Preparing Windows...' instead of just the normal 'logging in...' or whatever, then the desktop turns blue and it literally reset everything.

Like so. Attachment 27195

There, all the icons, the shortcuts, all gone, the wallpaper change to some default ones, in fact, windows 8 itself sort of became some default state, with only internet explorer and recycling bin icons left etc. My files are still in the computer, in fact, if I log out and log back in it'll change it back to what it is before.

Is it only happening to me? Is there anything to be worried about here? Is there a solution to all this random reboots?