XBR55X810C keeps rebooting after piugged in
I got a XBR55X810C for around three years. Recently it started to rebooting after the TV is on. I tried factory reset the TV from the settings and also press the volume down button and the power button while starting the TV. But by all means it is not working. After plugging the power cord, the TV loads with an Android logo, and then it just turn off on its own, and then restart all over in an endless loop.
It seems like a software problem to me. Do you know how can I reset the Android system on this TV? Thanks!