em0 watchdog timeout when NIC under load

For some reason network freezes in my FreeBSD 10 (also, I'm tracking Stable) box when the network is under heavy load (ie. when transferring files). A bit later I get
Code:
em0: watchdog timeout
on the console. The network card is a gigabit Intel PRO/1000 T and it worked fine in my previous server, but I started having problems when I updated to a newer system.

When I checked out the networking devices in bsdconfig, it says the card is using "Intel(R) PRO/1000 Legacy Network Connection 1.0.6". I googled a bit, and it seems that there's a 7.x.x driver out there which is not legacy, should I use it? Also, how can I use it instead of the default driver in kernel?
 
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