I know this is a ridiculous question but recently my HTC One X stopped working. See here
http://forums.digitalspy.co.uk/showt...923&highlight=

However since last Friday the phone seems to be perfectly fine and it's faster than before, even though it was crashing every 5 minutes and I couldn't do anything for two weeks. Even the repair shops said they couldn't fix it

Has this happened to anybody else before?

Maybe it hard reset.

That's what makes them smart...

When same problem occured to my HTC one, I had gone to AT&T store, the phone is being recalled.