Switched Cable Modem, Home Sharing Kaput (WiFi Sync Too)

I'm on Time Warner Cable in New York City. We had a Motorola Surfboard combined modem/router.
I was able to play movies from my MacBook Pro on my AppleTV through Home Sharing without a problem (and play music, view photos too). I also had no problem with WIFI sync for my iPhone and iPad.
Unfortunately that modem had a meltdown and they replaced it with an Arris combined modem/router/phone modem.
Now Home Sharing works extremely sporadically. I can't watch a movie for more than a few minutes before I lose the connection.
Turning the WIFI off on my MBP and then back on sometimes fixes the problems, sometimes not. But even when it fixes it, a few minutes later the connection is lost again.
My iPhone and iPad are on the same network of course and sometimes iTunes on my MBP notices them and I can sync over WIFI, and sometimes not. I'll shut the WIFI off and on, reboot, turn the iPad/iPhone off and on and nothing helps. It just picks up that the devices are sometimes and sometimes it just doesn't see them at all.
Each device (AppleTV, MacBook Pro, iPad, iPhone) works fine with our network, I'm able to do anything I want withough any issue (including on the AppleTV watching Netflix or movies through iTunes or listening to music through iTunes Match which I purchased recently).
But no matter what I do, including changing channels on the modem, turning it on then off, doing a total reset, erasing the network info from all devices and renaming the network and reconnecting, etc. Home Sharing is a total fail at this point.
Is there some setting in the modem configuration I need to change to fix this? Could it just be the modem itself?
I'm thinking I may have a TWC tech come with a new Motorola modem and see if it works again but any other ideas are appreciated.
THANKS!

Troubleshooting Home Sharing
http://support.apple.com/kb/TS2972
Trouble shooting AirPlay
http://support.apple.com/kb/TS4215
Troubleshooting Wi-Fi Sync
http://support.apple.com/kb/ts4062

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The functionality has been working fine throughout the OSX iterations; then came Mavericks.
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First i uninstalled any third party apps.
Then i repaired, went through Maintenance and Cleaning of the system using Onyx
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22/07/14 20:09:41,954 mDNSResponder[57]: ERROR: handle_resolve_request bad interfaceIndex 2
22/07/14 20:09:41,958 mDNSResponder[57]: ERROR: handle_resolve_request bad interfaceIndex 3
22/07/14 20:09:41,962 mDNSResponder[57]: ERROR: handle_resolve_request bad interfaceIndex 4
22/07/14 20:09:41,966 mDNSResponder[57]: ERROR: handle_resolve_request bad interfaceIndex 6
22/07/14 20:09:41,970 mDNSResponder[57]: ERROR: handle_resolve_request bad interfaceIndex 7
22/07/14 20:09:41,974 mDNSResponder[57]: ERROR: handle_resolve_request bad interfaceIndex 8
22/07/14 20:09:41,978 mDNSResponder[57]: ERROR: handle_resolve_request bad interfaceIndex 9
22/07/14 20:09:41,982 mDNSResponder[57]: ERROR: handle_resolve_request bad interfaceIndex 10
22/07/14 20:09:41,987 mDNSResponder[57]: ERROR: handle_resolve_request bad interfaceIndex 11
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22/07/14 20:09:42,032 mDNSResponder[57]: ERROR: handle_resolve_request bad interfaceIndex 22
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Switched Cable Modem, Home Sharing Kaput (WiFi Sync Too)

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