Im having the same problem, the Spen was working very well, i have the note 20 ultra, last weekend i went to the pool and taking pictures with my s pen, but when i tried to make a note, the line was been creating on the phone even with not touching the spen with my phone, then i read this comments about the tip, i made this steps to have a solution, the 90% of the times is good, but this morning it starts again, put the spen to charge in the phone and then it works again well, this kind of things drive me crazy but in my country there is no warranty so i asumed that i have to live like this