Internet connection on Intel iMac cuts out after screensaver.

Hello. First, I need to point out that the issue I'm having is specific to this machine; other computers in our home network running a myriad of operating systems have no trouble whatsoever sustaining their internet connection, including a MacBook. Whatever's going wrong is going wrong with this machine only.
We have a DSL connection from Verizon, being split through a NetGear router. We have tested this connection wired and wirelessly, and there is no flaw with it. The only problem is the iMac; the problem persists when it's connected to the router using an ethernet cable AND when it connects wirelessly through AirPort.
The problem is this: Whenever this iMac goes to screensaver or goes to sleep, its internet connection stops working after it wakes up. I don't mean to say that the connection gets interrupted, rather that it stops working entirely. I cannot ping any address from the terminal, not even the router. Safari and Firefox both stop recognizing the internet connection. The computer has to be restarted before the iMac will realize it has an internet connection again.
What can cause this, and what is the solution? Thanks.

I should also point out that the issue is specific to Mac OSX. This computer has a Windows XP partition. I just tested the issue on the Windows partition, both with screen saver and standby, and it was able to sustain its internet connection with no issues whatsoever. To clarify, multiple computers with Mac OSX have not had this problem, and this computer, using a different operating system, has not had this problem. The issue is totally isolated to this one specific machine, using one specific operating system.

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Welcome to the Apple Community.
Try deleting the problematic tune (electing to remove original file if/when prompted) and then re-downloading the file from the iTunes store.
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You can re-download content purchased from the iTunes store (availability varies depending on location) using the purchased option at the bottom of the screen of the iTunes app on your iOS device.
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I understand you are having issues with playback of a purchased song. If iTunes in the Cloud is available in your country, it might be best to delete the song from your computer, then re-download from your purchase history.
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http://support.apple.com/kb/HT5772
Music
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http://support.apple.com/kb/HT2519
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Internet connection on Intel iMac cuts out after screensaver.

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