powering off a mxqpro android tv box


Had one of these MXQpro v2 boxes running ok for 3 years now until recently has developed a perculiar fault when trying to power the box off with the remote it powers off but within a few seconds the blue lignt is on and it back powered up again.Checked the cec setting this is off.This also happens without any hdmi cable to the tv connected and ethernet also.Reflashed firmware no joy .Stuck what to try next anyone got any ideas please comment maybe you can help me.