Problem with Philips SDVD 8820 & iTunes

hey all.

my first post here, i run a Dell E1505 with an intel core duo 1.83 GHz, 1 GB Ram… i have the SDVD 8820 and all has been fine (i’ve only had it less than two months) except that when i do multiple cd burns with iTunes, after like 8 it will reach the end of the disc and just make soft clicking noises and never actually finalize the burn. once after this, DVD decrypter couldnt find the drive, and Roxio DVDinfo pro would not initialize. i restarted my comp and it worked fine. is there any reason the burner seems to fatigue after several burns? any help appreciated, thanks and merry christmas!