Turn off the CEC linked power off option of your TV. I don't know what's it called for your TV. But what you described is in fact correct and not a bug, CEC is designed to work that way, the TV tells all connected CEC devices to go sleep together, and this power control is on the TV side. It was wrong if it didn't work before. And it would be a bug if your TV is lack of such an option. e.g. SONY, LG, Samsung all got this option. Alternative: X8-H Plus -> SETTINGS -> Advanced -> CEC control -> Turn "One key power off" off.