S Pen disconnects
There are many users who say that the S-Pen intermittently disconnects from the smartphone and becomes unusable.
Workaround from users
Samsung has not made an official statement on the subject and has not yet acknowledged the problem. However, there is a workaround that users have found; Resetting the S-Pen. Another solution is to turn on the “Keep S Pen connected” option, which is disabled by default, to conserve battery life when the S Pen is not used for long periods of time.