I have a Lenovo Thinkpad T430s running Ubuntu 13.04 (technically, I'm running Linux Mint 15 but it's based off Ubuntu 13.04) and have been having serious issues with my wireless internet. While in Firefox or Minecraft, the wifi speed often drops or fails completely randomly despite the signal strength staying the same and others in the house reporting no issues. I've already tried disabling N and reverting to G but that only seemed to work for a short while. Please help!

P.S. If I can get this working again, I would also like to revert back to N.