Unknown burnphase



everytime i try to burn a dvd or cd on nero, it keeps saying unknown burnphase. earlier yesterday it was not burning at all i thought it was my dvd burner so i went on sony’s website and upgraded my firmware and then i let it rest. later on it was working fine, it was burning slow but it was burning. because it was burning slow i restored my computer to march 16, and today i tried to burn some movies and it said unknown burnphase. being the computer wiz that i’m not i upgraded the firmware and tried burning it again, the message was still on there, it acted like it was burning but nothing was on it. so i restored my computer again to undo the upgrade and now i get the same message but it doesn’t burn so i’m back to square one. i never know when to leave things alone. help me, please!!