[Q] Galaxy note screen flickering and fake battery drain

Hello,

I've recently started having a strange issue with my Galaxy Note. The screen starts to ranomly flicker like crazy and then the device turns off. When I restart the phone it shows that I have 1% battery... which is not true because if left alone the phone starts to "magically" charge on its own over the course of the next 15-30 minutes. I've read that the flickering screen occurs when the battery is low and the screen tries to maintain its brightness, but this isn't my case as i've had this happen even at 80% battery charge.

Has anyone encountered this problem before? I've already tried restoring to factory settings to no avail.

Any help would be much appreciated.

Thanks in advance !