Hardwire connection issue but not wireless..

i have uverse in St.Louis, and have great connections. I hardwire it from Xbox straight into the modem, didnt want to have wireless issues. Are you hardwired right into the modem or using a wireless connection/

First off I'm trying to connect by hardwire, not wireless, but, it asks to plug in a wireless adapter.. Again, wireless is not my issue, and it's an original Xbox

So, I understand that if you are having connection problems with GTA 5 but no other game, then the issue is likely a wireless connection versus hardwired?

You won't necessarily get a better ping time when switching to wired as your connection is still at the same number of hops. The wired connection will be better performance wise because it won't be subjected to wireless interferance from other WiFi devices
which can reduce your available throughput on the WiFi channel.

Try restarting your router and clearing your xbox cache. When I swapped from wireless to hardwired the difference was quite significant.