Hello, i have a Surface Pro 3, Windows 10 v.1903, fully patched. Two Surface Pens, one grey with a purple top button, one red with red top button. Both of them are paired and the top buttons are working. Problem is, the tip of both pens stopped working. Should very unlikely that two pens going defective at the same time, so i am looking for help with the troubleshooting. Searching Aunt Google leads to pairing and battery problems but barely nothing which helps me with troubleshooting the pen tip. Any advice on how i can get my pens back to working?