i find this in anather forum
" I am a local supplier of MAG devices. I have seen hundreds or good devices, however, a recent firmware update (maybe in the last 6 Months or so) has been giving me issues with many 254/256 devices I sell. All would be working well until you switch off your TV. HDMI-CEC feature included in the update would then switch off the device as well, (apparently it's a default feature now?). The issue is that when you switch on the device afterwards, it would just not boot via its own remote, only a hard reset will make it work again. I have disabled 'HDMI EVENT REACTION' in the settings but to no avail"