My Samsung Galaxy Note 4 keeps on turning off .


AC Question

and I have to take battery out and replace to start and when this is done the Andriod icon is centre screen which says Downloading
Do not turn off target

And in the top left hand corner of screen it says

Could not do normal reboot
and a lot of numbers

When it does turn on it is very slow to respond until it seems to warm up and works ok then all of a sudden turns off