Hi, I posted about my wifi problems and FINALLY found the answer. Its my external hard! I couldn't believe it. I was browsing a forum and someone discovered this for themselves and I was like no way. Turns out, that was the problem. Its a 4TB Seagate Slim Fast Portable. Its my Time Machine backup and most of my important data. I unplug it and my MBP connects to wifi perfectly, I plug it in, and it slows...then disconnects. Wtf can I do to fix this? I cannot believe this is for real. Thanks for any help!