If your Samsung Galaxy Note 8 S Pen, stylus or whatever you like to call it doesn’t work correctly, it’s probably due to magnetism. On the Samsung community forums, a few people returned their Samsung Galaxy Note 8 phones because their S Pen didn’t work correctly, and they experienced trouble afterwards. I recommended they check to see if their case has a magnet in it e.g. a magnetic clasp, and sure enough it was the culprit. Unfortunately it is quite common for folding cases to include a magnetic clasp, and it does prevent the Samsung Galaxy Note 8 S Pen from working correctly, but this is a simple fix and I hope it helps a few people.