I went to asus service centre they said it maybe due to FOTA update which was not installed properly. I believed and this guy installed firmware and told me to analyse the device for 2 days. Unfortunately it got restarted the day itself. From all this threads i guess it would be motherboard issue. But i dont understand why this happens. My guess after heavy usage its getting heaten up and restarting. Anyways worst decision i ever made. I am at service centre only trying to update another firmware one more time. Dear Asus you should have your manners.