2011 Macbook Pro - Wifi Issues

Hello,

For quite some time, my 2011 Macbook Pro (2.2 ghz i7) has been having problems staying connected to my wifi. I have no problem initially getting connected, but the connection drops. Sometimes it can hang on for an hour, but more often it only stays connected for 5-10 minutes. On the status bar at the top it still says I'm connected, but I cannot load anything off the web. The only way to solve the problem is to manually disconnect and then re-connect. Wash, rinse, repeat.

I hoped it was perhaps some sort of software issue, and I wanted to upgrade to a SSD anyway, so I purchased a SSD and performed a clean install of El Capitan. I'm currently running 10.11.3 beta, but I've had stable release versions on here also and I have the same problem no matter what version of the OS I'm on. It started with Yosemite.

The problem still persists, so I'm afraid of a hardware problem. I have many wifi devices, and my Macbook Pro is the ONLY device I have that has this problem - so it's nothing wrong with my internet connection or router. My iPad, iPhone, Xbox One, and various other devices have no issue.

Has anyone else experienced this or does anyone have a fix? I'm still holding out hope that it's something software-related.

Thank you!