Today my tablet was plugged in and inexplicably turned off without any apparent reason (it was plugged in). All the lights turned off and this is not normal when it is plugged in. Trying to turn it on was completely useless. I removed the battery and inserted it again and now it worked for a while, then again it turned off in the same way as before. This time removing and reinserting the battery was useless. The only thing which make the light turn on for a second is when I insert the battery. What could have been happened?