Problem connecting to internet after NEW 27" iMac makes up from sleep

Ok, I have a brand new 27” iMac and when it connects to the internet after waking up from sleep mode doesn't have any download speed.. See image
This only happen when it wakes up and the only way to fix it is to restart the computer. I have tried turning on and off the airport as well as messing around with other settings and nothing seams to fix it.
I am using an Apple Airport Extreme with a Comcasts 20mb connection.
This is the only computer in the house that has this problem (3 other MacBook Pros) And while the iMac is registering no download speed, the other computer are cranking out at over 20mbps.
The fix for now has been turning off the power saving setting to allow sleep. so no sleep=internet.
Any one having this problem? I don’t really want to lug it back to the apple store but I will if I have to.

after waking up from sleep mode doesn't have any download speed..
Intel-based iMac, Intel-based Mac mini: How to reset the System Management Controller
Change your router channel.  Sometimes this all you will have to do.
I don’t really want to lug it back to the apple store but I will if I have to.
You don't have to.  Call Apple tech support.  They can give you instructions over the phone if the issue is just software.  You will have to bring it in if tech support suspects you have a hardware issue as they need to run diagnostic testing.

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