Hi,
Please run through this guide for general troubleshooting tips:
http://www.displaylink.org/forum/showthread.php?t=896
To help us investigate the issue, please download this tool:
http://www.displaylink.com/support/ticket.php?id=269
As soon as the issue is seen again, please run it and select "Gather Support Information"
It's also worth trying the "System Compatibility Check" to see if anything is flagged up.
Thanks,
James