Could it be the battery losing connection?
Note2 or Note10, that is the question
I would NOT scrape the GOLD plating off of the battery contacts.
Maybe a pencil eraser to clean them, then wipe then with a cloth. Or just wipe them with a cloth.
It none of that helps, get a replacement ordered.
Mines does the same thing and then android updates takes a whole minute to reboot.
any solutions yet?