I bought an Acer Switch 5 at the end of November 2019. I bought it second hand but the previous owner didn't use it so it was in excellent condition. Sometimes the pen stopped working in mid-usage but I switched the battery clicked on the buttons and it was back in work right away. This happened once or twice later but it wasn't annoying. In these situations, there was no visible cursor and no input. After about a month of use, the pen stopped working from one day to another. At this time, I am able to see the cursor but there is no input whatsoever. The touchscreen works, the battery is fully charged. I tried to update, uninstall then re-install drivers and so on but nothing seemed to work. If it is a software problem how do I solve it? Would changing the tip or the whole pen help? Did anyone had a similar problem before? if yes, how did you solve it? 
I am desperate to get it solved as my semester starts soon and without the pen, I cannot use it as I was intending to.