Hello, I am having troubles with wifi since my clean install of El Capitan 10.11.4 on my MacBook Pro 9,1 (15" mi 2012). I can connect sometimes to my wifi router but the connection is not staying. A ping in the Terminal show regularily no route to host or very long response time. When I try to disconnect and connect again to the wifi, I can't (impossible to connect). I tried on another router, or with my phone connection shared via wifi, same behavior. I tried several things to fix the problem: > reset PRAM > reset SMC > deleted networking preferences and recreated them > deleted files in /Library/Preferences/SystemConfiguration/, rebooted and try to connect again (solves the problem temporarily) > disabled bluetooth > disabled ADWL I am desperate, I don't know what to do else to fix my problem ! Any advice ?