This happened to me aswell, but I eventually fixed it.

This is what you need to do.

1. Go to system settings.
2. Go to network settings.
3. Go to configure network.
4. Scroll right, then go down to 'restore default settings'.
5. Once you do that it will wipe the DNS settings off and take you back to your previous settings.

You might have to connect back to your router by just clicking on it and typing in your password to connect to it again.

6. Go to memory.
7. Hover over your hard drive.
Press 'Y' and click 'clear system cache'.

Once you have done all this sign back in and play GTA and it should be gone.