Every time my IMAC is unused for a period, then goes to sleep mode, it loses it's wireless connection and when I wake it up, it DOES NOT automatically reconnect. I have to go to systme preferences network and request that it reconnect.

My iMac is set up wireless.  Everytime it's allowed to go in sleep mode, it loses wireless connectivity.  Then, when I wake it up,  I must go to System preferences,  Network,  and request it to reconnect to my home wireless network.   It always does this successfully, but it's quite annoying that it seems unable to achieve this on it's own.  My iPad 2 and kindle can do this,  why not my iMac?

This appears to be a known issue, there are a couple of things both of you should do, first file a bug report in www.apple.com/feedback.
The next thing is more a work around than a fix. Instead of putting your computer to sleep just put the display to sleep. You will find this in System Preferences - Energy Saver. Set the computer sleep to Never and then set the display sleep to what ever time you prefer.

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