Another year, another Note, another S-Pen issue. Samsung made sure this year the Galaxy Note7 users can't insert the S-Pen backwards, and yet a new flaw seems to be plaguing some styluses. As it turns out, the mechanical button on the S-Pen, which ejects the stylus from the silo, may stop clicking. And no clicking means no S-Pen ejection from within the Note. You can still get it out with a pin, or some hitting on the S-pen's hole, but once you start having problems with it, you may have to resort to doing this quite often. There are already a few videos on YouTube showing the issue and...
Source: http://www.gsmarena.com/the_new_spen_can_get_stuck_in_the_galaxy_note7-news-20241.php