I tried turning off checksumming, first just in domU, then in both dom0
and domU, but the network still stopped.

However I have figured out what the problem is.  The domU's network is
becoming unresponsive immediately after 4GB of data has been transmitted
by the eth0 device, as reported by ifconfig, and the tx counter wraps
around to 0.  This happens about once every 24 hours on my machine, and
most often happens when sending a big file - however it's not the
throughput that is the problem.

Should I be opening a new report for this bug, or it related to the
above?

-- 
xen guest  kernel bug:  'kernel BUG at 
/build/buildd/linux-2.6.24/debian/build/custom-source-xen/drivers/xen/netfront/netfront.c:785'
https://bugs.launchpad.net/bugs/218126
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