i too have this problem with my samsung dvd drive,while my samsung dvdrw dont have any issues. BUT, this phenomenen is not constant and regulaar, sometimes the drive comes out by itself..and if we close, it goes in normaly...this happens once in 25 times, so i have no issues with it..Well this ought to be a h/w issue, as i am damn sure that my pc dont have any viruses / trojan / spyware kinda stuff...first i have 2 firewalls installed, ms antispyware , and KAV..all test results are clean..
it seems , samsungs are prone to this kind of weired ideas.....!!