Hi and Welcome!
does this happen with all game DVDs or only with a few?
Give, these discs are unscratched original discs, I would contact the game manufacturer for advice.
Very often, it's the copy protection that's causing trouble.
If you want to take the risk, you can flash your drive to Samsung SH-S182D SB07 firmware. The release note mentions "Game CD support". See my signature for further details.
Also please tell us the firmware version of your drive. You can use Samsung Wininquiryutility to find out.