Q: I am starting to hate my iMac. Every five minutes wifi disconnect

Sometimes a new set of network preferences can help when Wi-Fi drops intermittently.

Open the Finder. From the Finder menu bar click Go > Go to Folder

Type or copy paste the following:

/Library/Preferences/SystemConfiguration

Click Go then move all the files in the SystemConfiguration folder to the Trash.

See if that makes a difference.

Your Mac will generate a new SystemConfiguration folder for you.

If that didn't work, try wireless diagnostics. Instructions here >   Wi-Fi: How to troubleshoot Wi-Fi connectivity

Here is a link to various wifi 'fixes' that sometimes can help users:

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