Do not reconnect to Time Capsule, AppleTv or my others Mac...

Need help, I search on the web but did not find anything about this issue. After I wake up my iMac from sleep, Time machine does not find my Time Capsule and it does not appear in my Finder either, same for our 2 other Mac (MacBook and Mac mini) they don't appear in my Finder on the iMac. AppleTv does not appear in iTunes as well as the shared library from the other Mac. The only way to get it back is to reboot then it will be ok until the next time it goes to sleep.
AirPort Utility scan does not find Time Capsule or AirPort Express....but I have full WiFi signal and no problem to connect to internet
Any idea as to what I should do?
I don't have this issue with the MacBook or Mac Mini. The only software that I installed on my iMac recently and not on the other is Caffeine, can it be the root cause? I can't remember if I had this issue before I installed the software.
Thanks!

Hello FoxFamilyVA
Check out the first article below to go through some troubleshooting options to get your iMac to connect to your Time Capsule. I would go through and remove it from the list of known networks that you join and then add it back in. I would also recommend that you try and create a new Network Location to see if there is an issue with your current configuration.
Wi-Fi: How to troubleshoot Wi-Fi connectivity
http://support.apple.com/kb/HT4628
Using network locations (Mac OS X v10.6 and later)
http://support.apple.com/kb/HT5289
Regards,
-Norm G.

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