If you are having WiFi issues there are several things you can do to troubleshoot. Of course, there are third party programs you can buy..
I have used several of these WiFi fixes before. The problem is, there is no single fix for WiFi issues these days, it usually is..
People have been having WiFi issues in Yosemite for quite a while. The latest 10.10.2 update resolved many of these, but some problems still linger...
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