my Galaxy Note edge keeps turning off anywhere between 8 -35 %

My note edge has recently done two updates, after the first it kept intermittently turning off & freezing, following the second update it is still turning off anywhere between 8 - 35% battery, freezing & now showing an almost blank screen with an android icon in the middle & some text in the top left corner stating that it was unable to reboot (among other things). the only way I have been able to do anything once this happens is remove the battery.

any ideas?

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