Why does restoring an iOS device kill my home internet connection?

I never noticed this happening before iOS 5. Every time I restore an iOS device (iPhone 4, 4S and iPad 1), all goes well up until I click 'restore from backup', then iTunes starts chugging away like normal but my internet connection drops. I checked other devices in the house and they lose their internet connection as well. If I shut off the modem and router for two minutes, the internet connection comes right back.
This happens if I try the restore from a Win7 Dell desktop connected via ethernet and when I try it from a Compaq Win7 laptop via wifi.
I'm not sure if Comcast is throttling connections to iTunes or what. The iOS software downloads fine (800 MB in 11 minutes). Normally, this wouldn't be a big deal but I'm worried what kind of effect losing internet midway through a restore process might have on the device.

I never noticed this happening before iOS 5. Every time I restore an iOS device (iPhone 4, 4S and iPad 1), all goes well up until I click 'restore from backup', then iTunes starts chugging away like normal but my internet connection drops. I checked other devices in the house and they lose their internet connection as well. If I shut off the modem and router for two minutes, the internet connection comes right back.
This happens if I try the restore from a Win7 Dell desktop connected via ethernet and when I try it from a Compaq Win7 laptop via wifi.
I'm not sure if Comcast is throttling connections to iTunes or what. The iOS software downloads fine (800 MB in 11 minutes). Normally, this wouldn't be a big deal but I'm worried what kind of effect losing internet midway through a restore process might have on the device.

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