I bought a notebook 9pen a year ago . A year later, at some point, the pencil stopped working when opening the laptop on 360, and after some time, it stopped working at all. Sometimes a soft reset in the BIOS helps. Sometimes an exclamation mark is lit on the I2C HID Device Driver and disabling-enabling also solves the problem, but for a short period of time. The screen responds to the touch of a hand in any position of the laptop.
I am sorry to hear about this. Have you run the Samsung Update and Windows Update to make sure the software is up to date?
Please try the steps at this LINK to see if you get any different results.
A factory reset of the device may be in order. Please ensure that you back up all data prior to doing so.
Do you have another pen that you may be able to test?
Can I have your full model code and serial number via private message?