Computer lock up when docking to E-Port

At work I use M4400 that is docked to E-Port Plus replicator. If I start the laptop while docked, everything works great.

When I undock the laptop (while still running) everything is still fine. Although sometimes the laptop lid need to be opened and closed twice for the display output to show up on the laptop screen.

The real problem occurs when I redock the laptop (while still running) to the E-Port Plus replicator. Most of the time, the display output does not transfer to my external monitor (22" Dell monitor). The laptop appears to be locked up, and I need to reboot the computer.

Does anyone know what the problem is and how it can be resolved?

Thanks for your help.

 

Moderator:

Please delete this post since I reposted it in the Precision forum. There was no option to delete the posting myself.

Thanks.