I found this thread via Google, so i registered an account, because i have a similar Problem. I have a new X11SBA-LN4F, installed the newest pfSense build on it and configured (I switched from a X10SBA, because i Need Minimum 3 NICs). So far so good, but i have also These Watchdog timeouts. These occurs only on the igb2, which is my LAN Interface. I made some Tests and saw, that the timeout only occurs on heavy network load (LAN -> WAN / WAN -> LAN). Firmware and BIOS of my X11SBA-LN4F are also up2date. I bought this board 1 week ago.
Is the only solution to get it to work, to RMA this board?