My Wifi keeps randomly disconnecting on my iMac (late 2012) since upgrading to Mavericks.

Here are some WiFi troubleshooting tips that helped some users on Lion and Mountain Lion. They may possibly still be relevant to Mavericks.

In no particular order:

Check wifi security - if it's WEP change it to WPA or WPA2 (preferably, as it's more secure)

Change the wifi channel on the router

Create a new Network Location: http://support.apple.com/kb/HT5289

Reboot the router

Also take a look at this link and the links within the article for other ideas. They mainly reference Lion, but still seem to be relevant to Mountain Lion and Mavericks:

http://osxdaily.com/2011/11/06/lion-wi-fi-problems-solution-mac/?utm_source=feed burner&utm_medium=feed&utm_campaign=Feed%3A+osxdaily+%28OS+X+Daily%29&utm_conte n t=FaceBook

...and this link:

http://osxdaily.com/2012/11/30/resolving-stubborn-wi-fi-connection-problems-in-m ac-os-x/

My new MacBook Air was effected by this problem (but the old white MacBook was not). Here's what I did 2 days ago in System Preferences in this order: renew DHCP Lease, uncheck Keychain in iCloud, and then restart the computer. So far so good.

Here's a related discussion. Looke at the last page: https://discussions.apple.com/thread/5490250?start=30&tstart=0

Phil

For those using citrix or juniper network connect, this fixed the problem for me:

http://blogs.citrix.com/2013/10/31/citrix-on-osx-10-9-mavericks/