Has anyone else had severe wifi problems after upgrading to Yosemite? My wifi drops constantly. There are a number of people on the Apple forums with the issue, but no fix to date.
Mine doesn't drop, but the internet is much slower
No problems. And I'm getting twin-turbo speed internet. Fastest it's ever been 58mbps down load. Never came close to that with my old sony Vaio. Bought this Imac last month.
I installed a new Netgear AC router this weekend and my iPad was dropping Wifi every few minutes/seconds. I finally turned off the 2.4 ghz network - I didn't have any devices that needed it - and the did the trick. So, you can try to disable the 2.4 ghz network and see if connecting at 5ghz helps.
Will it fix itself or do I have to uninstall and then reinstall it?
Clear your network settings and preferences.