I have a Lumia 620 with developers with wp 8.1.... For some reason my phone got hung. I held on to volume down + camera + power button for a few seconds ( which I generally used to do earlier) from my phone when it was on wp8 and used to hang... But what happened today is the phone took around five minutes to boot up.. But when it did boot up my memory card was swiped clean.. Nothing on it except basic folders.. I tried to connect the memory card to my laptop and evn tried a few data recovery tools but I got nothing... I lost almost 11 gb worth of songs and images.. Any body has any idea what the **** happened?? Anybody else faced this?? Did I do something wrong?? Do others need to be made aware of this???