BUT, if I reboot, everything is fixed instantly. Same if the computer goes to sleep, and I try hours later. IF I disconnect the wifi, and then try to reconnect, I get a 'can't connect' error.
I stay connected to the internet and can still SLOWLY go to web pages etc, but tat's it. I say partially, because the upload connection isn't affected, only drops from 100Mbps to below 1Mbps. HOWERVER, after a few hours, the wifi partially stops working. While the MBP can't do AC, it connects via N and has had a good speed boost. I recently changed routers, going from an N router to an AC Router. Computer: Macbook Pro 2.2 GHZ running 10.11.16