Macbook Air only connects to the internet for a few seconds at a time.

My 2013 Macbook Air (10.8.5) will only connect to the internet for a few seconds. It recognizes the wifi, but will just timeout when trying to access a website. If I turn Wifi off and then back on, it will work for another few seconds, only for the same issue to come up. I've tried EVERY SINGLE troubleshooting tip I could find and nothing works. I've renewed DCHP, rebooted my Mac, rebooted the router, network diagnostics, everything. I've scanned with Sophos multiple times and nothing has been detected. My 2007 MacBook Pro works just fine on the network as well as my roommates Macbook and my Apple TV. I have no clue how to fix it and am praying someone knows what to do. Please help!

Start by getting rid of "Sophos," which is worse than useless.
Remove the Sophos product by following the instructions on this page, and also this one, if applicable. If you have a different version, the procedure may be different.
Back up all data before making any changes.

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