Your first option should be restarting your modem. Restarting your modem recycles your modem's connection and may immediately resolve the issue.
Be sure that your PlayStation 3 is not behind a router/firewall. If it is not possible to disable or remove the router/firewall, you will need to open/forward the ports for James Bond: Goldeneye 007 Reloaded. James Bond: Goldeneye 007 Reloaded transmits and receives network traffic on port 3074(TCP). The exact details on opening/forwading a port is specific to your router. For more information check with the router documentation or manufacturer.
The problem may also be related to the status of your ISP, your internal network, or that of the game host. Due to the dynamic nature of the internet and the variable levels of traffic, you may have issues getting a good connection to a multiplayer game. This can sometimes be remedied by making sure that no other devices on your network are using bandwidth. For instance, if you are downloading a large file on another computer while trying to play online with your console, your connection to the host can be negatively affected.