You now have a Banana Pi M3 running at 1800 MHz / 70 °C while being totally idle (insane!). So now put some load on it and watch the whole device shutting down.
What you (and the @sinovoip support muppet that liked your post) have overseen is the definition of ths_trip2 -- as soon as this temperature is reached a clean shutdown will be executed. So to be ready to destroy this crappy hardware you have to increase this too
ths_trip2_0 = 155Or what are you trying to do? You just want to use this device idle? Or should A83T do some work?