New 27" iMac when off for a few minutes looses net connectivity

Just purchased a new iMac 27" I5 system. When I leave my computer on, walk away for a few minutes, then return, call in Safari and it states that I have no Internet connection. I then close safari, call it in again and it is immediately connected. Had a MacBook Pro for four years on my same hardware network never had this problem. Any help will be greatly appreciated. Thanks in advance.

Hello,
Make a New Location, Using network locations in Mac OS X ...
http://support.apple.com/kb/HT2712
10.5, 10.6, 10.7 & 10.8…
System Preferences>Network, top of window>Locations>Edit Locations, little plus icon, give it a name.
10.5.x/10.6.x/10.7.x/10.8.x instructions...
System Preferences>Network, click on the little gear at the bottom next to the + & - icons, (unlock lock first if locked), choose Set Service Order.
The interface that connects to the Internet should be dragged to the top of the list.
f using Wifi/Airport...
Instead of joining your Network from the list, click the WiFi icon at the top, and click join other network. Fill in everything as needed.
For 10.5/10.6/10.7/10.8, System Preferences>Network, unlock the lock if need be, highlight the Interface you use to connect to Internet, click on the advanced button, click on the DNS tab, click on the little plus icon, then add these numbers...
208.67.222.222
208.67.220.220
(There may be better or faster DNS numbers in your area, but these should be a good test).
Click OK.

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Hello,
Make a New Location, Using network locations in Mac OS X ...
http://support.apple.com/kb/HT2712
10.5, 10.6, 10.7 & 10.8…
System Preferences>Network, top of window>Locations>Edit Locations, little plus icon, give it a name.
10.5.x/10.6.x/10.7.x/10.8.x instructions...
System Preferences>Network, click on the little gear at the bottom next to the + & - icons, (unlock lock first if locked), choose Set Service Order.
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Instead of joining your Network from the list, click the WiFi icon at the top, and click join other network. Fill in everything as needed.
For 10.5/10.6/10.7/10.8, System Preferences>Network, unlock the lock if need be, highlight the Interface you use to connect to Internet, click on the advanced button, click on the DNS tab, click on the little plus icon, then add these numbers...
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So I've been away for a while and when I got back to US I've had some issues.
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When I use an internet browser everything goes well for a while and then internet suddenly slows down or shuts off , it dosen't show dissconnect or anything.
The only thing that happens is that pages won't load, or they load super slow. This usually happens for a few minutes.
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I really don't know what could've causes this and I'm not really sure how to check, I would appreciate any help.
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Have you tried resetting the SMC?

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Hello:
Click on the icon in your menu bar. The drop down menu should indicate if Time Machine is backing up correctly. I would try the things I suggested before you spend money with AppleCare. My expectation would be that they would tell you to do the same things.
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New 27" iMac when off for a few minutes looses net connectivity

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