I have a Lenovo T410 laptop running Ubuntu 11.10. At the office, I have it on a (Lenovo) docking station to which is attached an external monitor, keyboard, mouse, and external hard drive. I don't have a wired internet connection, so I connect wirelessly.
On occasion (about twice in three days) the entire computer will randomly lock up. The only way to proceed is to do a hard shutdown and reboot. My computer doesn't lock up like this anywhere else.
I don't know where to begin to troubleshoot this problem. I suspect it has something to do with the hardware configuration (involving the docking station) and the fact that my only network connection is via wireless. The reason I think this is that my computer has real difficulty maintaining the wireless connection at the office (I've pulled many hairs trying to troubleshoot this problem as well, since it doesn't have any trouble maintaining wireless connections anywhere else) and I've noticed that some software doesn't play nice when it doesn't have a connection to the internet (e.g., banshee).
I know this isn't much to go on. If someone could help me solve the problem, that would be great, but I'm really just looking for some suggestions as to how to go about troubleshooting it.