@Graham, do you see any kind of panic or oops messages on the screen or in /var/log/kern.log when this happens? When it hangs, you might try waiting several seconds then pressing Alt-SysRq-S followed by Alt-SysRq-B and then checking kern.log after rebooting.
For the rest of you experiencing problems, it would be helpful to see the output of dmesg or the /var/log/kern.log file after you experience problems with the build from comment #19.
@Graham, do you see any kind of panic or oops messages on the screen or in /var/log/kern.log when this happens? When it hangs, you might try waiting several seconds then pressing Alt-SysRq-S followed by Alt-SysRq-B and then checking kern.log after rebooting.
For the rest of you experiencing problems, it would be helpful to see the output of dmesg or the /var/log/kern.log file after you experience problems with the build from comment #19.
Thanks!