Streaming video to ATV2 locks up iMac

I'm streaming video from my iTunes library to an AppleTV 2 over wifi. The iTunes library lives on a 27" i7 iMac w/ 8GB of RAM running OSX 10.6.8. All of the videos are .m4v files that have been run through Handbrake and transcoded to the "AppleTV 2" profile. I'm running the newest version of iTunes on the iMac (10.4). The AppleTV is also running the latest software version (4.3). The iMac is plugged into my DLink 802.11n router; the AppleTV pulls a DHCP address from the same router and both devices are on the same class C subnet.
After streaming for some period of time (sometimes 20 minutes, sometimes 2 hours) the video playback stops and I get dumped to the main Apple TV menu with the message "Connect your computer to the network". I walk into the computer room and the iMac has completely locked up; mouse won't move, keyboard input doesn't do anything, clock in the menubar freezes, etc. I have to hold the power button down until the iMac turns off, then reboot it. I've filed a crash report every time after rebooting but the problem persists.
It doesn't seem to matter if I'm running any CPU or memory intensive stuff on the iMac; I've had it lock up when it was sitting idle and iTunes was the only thing running. It also doesn't seem to be a problem with the AppleTV; I can stream Netflix for hours on end without problems.
Anyone seen this problem, know of a fix, or have any suggestions?

thank you, i was guessing its not possible but i saw someone here saying that his videos working even better from his iphone to atv then his imac to atv....just wanted to see im not crazy.
if i may ask u another thing, in order to see a video from my mac does it have to be .mov format (quick time player)? and if so- i need to convert all files to this .mov kind? how do u do it?

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    Part 8 of 8 done at … sec
    [Process completed]
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