I'm building a small weather station for my parents with my pi. I wanted a fairly decent image quality so I went for the Logitech C920 It all works pretty well for a couple of hours mostly, with arch linux, i can capture full 1080p, with no image corruption.
However, suddenly the network and usb connection drops, and there's nothing to do except pull the power cord and restart it.
I've updated to the latest firmware and kernel, tried both arch linux and raspbian, tried different cabels, power adapters and usb hubs and the bandwidth quirk described in http://elinux.org/R-Pi_Troubleshooting#freeze
and i also verified the voltage with a multimeter and it's in the acceptable range, but it still crashes.
Before the connection drops, you can see all that the network leds on the motherboard turns off for a second or two, then comes back on, so there's something going on there.
Just found out that the system itself dosen't crash, it's only the network connection, if i play a sound with aplay, it keeps on playing after the network connection drops. Maybe there's a way to reset the usb/network services?
Since it only needs to upload a image / temperature data every ten minutes, that could be a ugly workaround for now.