After the 2015-002 update to Mavericks, I keep losing wi-fi connection with my Macbook Pro.

After the 2015-002 security update to Mavericks, I keep losing my wi-fi connection with my Macbook Pro. My Kindle Fire stays connected, so I'm assuming the problem is connected to the update. I have to be right next to the router, or sometimes the next room, to stay connected. Sometimes it stays connected for a few hours, no matter where I'm at in the house, then all of sudden it won't. Haven't found a rhyme or reason to it at all. Can anyone help me?

Try Wireless Diagnostics.
Wi-Fi Problems in OS X Yosemite
Wi-Fi Problems in OS X Yosemite (2)
Wi-Fi Problems in OS X Yosemite (3)
Wireless Diagnostics
Also try turning off Bluetooth.

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