Hi and Welcome!
That's not normal. Either the drive is faulty, or something is seriously wrong with your Windows installation.
tryed new firmware SH-S223Q_SB03.exe ,n Patch_Utility_Samsung-3.4.7 . all done well .but still alway eject by it self.
Such issues are not fixable by any firmware, officially or a modified one.
is there a way to fix this kind of problem ?(...) by the way it start to happen after i uninstall nero .
At first you need to find out, if there is a software (or Windows) issue or a bad drive.
Restart your computer in safe mode and see if the problem persists.