I start and shut down my Eversolo A8 alsways with external power switch. Now A8 with latest firmware fisrt did not start, only after I used remote control it worked again. BUT now it does not turn off , instead it keeps blinking, ever after power off and power cable off!!
The power button is more for if it freezes or is going to be stored. Touch knob right it powers down. A longer touch it brings up a menu.