I realized that my xperia SP phone was switched off automatically. When i went to turn it back on, the phone vibrated three times and nothing happened. I tried plugging the phone into the mains and charging but the phone kept vibrating in a series of three vibrations. I tried to reboot the phone using the hardware button below battery but it didn't help. after an hour or so when i gave another try to witch on the phone using power button it powered on successfully but after some it switched off again with three vibration and this madness is going on contineously.
