Hi.
I have same issue
I'm from Ukraine, and I can't return or change my pen.
But... I think I've found a solution for me.
I've just turned off my Bluetooth. Some of pen's functions don't work(like top button click) but I can write, I can erase .
At this moment it's a best solution for me. All this day it works fine without any issues.
I will keep monitoring it
hope this will be useful for somebody else.