Philips dvdr,s stop ejecting

Hello all I have two philips dvdr,s and they are both double capacity series 16x and the both of them stop ejecting, when i try to eject any one them it freezes my computer :a so i restart and looked in my bios ide funtion and they are both their but no eject. :confused: i then phone up a friend that buyed the same dvdr as the one i got and has the same problem so i was thinking that these dvdr are simply rubbish. I,ve only had it for 8 months and thats a record in my eyes tbh