[Q] HTC gone insane topic

Im using my HTC desire x updated to 4.1.1. One morning suddenly, my phone suddenly crashed and switched off and gave 5-6 vibrations. i tried to factory reset it but it failed. tried to restart some hours later.. it did, but froze and crashed again. previously when i went into the bootloader, it showed ***LOCKED*** and ***Security warning***, but later, it disappeared. still going with those Freezing, crashing and vibrating problems. any guesses for the problem?
HTC desire x
4.1.1 stock