Why does the iPhone drop from iTunes during Wireless Sync?

Question

Alright, so in my bedroom I have full wifi bars, occasionally when I move to the far corner I drop one single bar on the wifi but other than that, I never have a problem.  Until I try to wireless sync.  Then the iPhone 4 switches back to 3G for less than a second and then goes back to wireless again (still pleanty of bars on wifi).  Of course, this is just enough to stop the phone from syncing wirelessly with iTunes.
I have done speed testing and local network ping testing and all that kind of thing, there is no reason for the iPhone to drop the wifi connection.  I can stream netflix or hulu at maximum quality over my local wifi.  Using iSSH I can VNC into the Mac without problem and using Filez I can SFTP to the mac or use AFP and transfer files without issue.  I even transferred 2 Gigs worth of files from my living room to the bedroom over the local wifi with consistant good speed.
What gives?  Is this some kind of strange design flaw or what?
This ONLY happens while trying to wirelessly sync with iTunes.  And after, I cannot try to sync again until I reboot my phone and restart itunes.

Answer 1

Have you gone to the video tab (in itunes) and selected sync movies and selected the movie that you want synced?
http://manuals.info.apple.com/enUS/iPhone_UserGuide.pdf