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After Mavericks Update Arris Modem now going to standby mode when iMac sleeps

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After installing Mavericks on iMac, whenever the iMac (connected wirelessly to the network with Airport Extreme 5th Gen) goes to sleep it is causing our modem to enter standby mode which limits internet access to all devices on the wireless network e

After installing Mavericks on iMac, whenever the iMac (connected wirelessly to the network with Airport Extreme 5th Gen) goes to sleep it is causing our modem to enter standby mode which limits internet access to all devices on the wireless network even when they are actively requesting data from the internet. As soon as the iMac is woken up the modem comes back out of sleep/standby mode and everything works fine. The modem is connected directly to the Airport Extreme WAN port and all devices just use wireless internet. The only resolution I've found is stopping the iMac from entering sleep mode in Energy Settings but this is not a long term solution. Anyone else having this issue?
The modem we have is an Arris TM722G.
Thanks in advance.
I've also tried resetting PRAM, creating a new network location, releasing and renewing IP.

The replay answer
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If you can get the computer to start in Recovery, then access OS X Utilities,
an attempt could be made to Repair Disk using the Disk Utility there...
Several instances of an upgrade leading to issues in Mac OS X was due
to some previous condition in the computer, or problem in the hard drive,
or maybe insufficient or low-quality RAM installed; among others, before
the last OS X upgrade was installed. And then the extra effort of processing
a new OS on top of other bits, can cause the computer to act up or fail.
What was the previous OS X version? How old is the iMac...?
Did you upgrade from Snow Leopard 10.6.8 to Mavericks 10.9.2?
•Apple - OS X Recovery restores your Mac
http://www.apple.com/osx/recovery/
•OS X: About OS X Recovery
http://support.apple.com/kb/ht4718
•OS X: About Recovery Disk Assistant
http://support.apple.com/kb/ht4848
•OS X System Recovery: Explored & Explained - Tuts+ Mac computer skills tutorial
http://computers.tutsplus.com/tutorials/os-x-system-recovery-explored-and-explai ned--mac-60375
There may be a hardware problem behind the issues your computer
presents, and a diagnostic inspection &/or testing may need to be
done at a Genius bar, at an Apple Store; this is cited as a free service
at US and Canada Apple Stores. If you do not have one, you could
enlist the aid of an independent authorized Apple service company
who has trained technicians on staff; these are often also resellers.
Good luck & happy computing!

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