I currently have a late 2013 13 inch Retina MacBook pro with a 2.6 GHz intel core i5, 8gb of ram, and 512gb of flash storage. I am currently running 10.9.5 (Mavericks) and I am having some issues. My issues are wifi issues. I am having issues with wifi not working at all or working very slowly. I already know it isn't my wifi router because my other devices (iPad Air 2, iPad 3, iPhone 5s, and iPod Touch 5th generation) all work like normal on my wifi connection. I thought maybe it was the wifi card in my Mac or whatever it is called that was going out or something so I ran the Apple Hardware Test on my mac and it came back with no issues. I can restart my Mac when I am having wifi issues to get wifi working like normal again for a little while but I am starting to get very frustrated. I have kind of ruled that my wifi issues must have to do with Mavericks on my Mac. Should I upgrade to El Capitan and see if my wifi problems disappear? I am nervous about upgrading because of all of the bad reviews on the App store. All of the bad reviews is the reason why I didn't upgrade to Yosemite last year and the reviews for El Capitan are worse than Yosemite. I currently am a student going to college and I need my Mac to work when I need it. What should I do? Does anybody have any other reasons why just out of the blue I am having wifi issues?