The mouse stops and moves jerkily, and sometimes won't register clicks. Gnome stopped responding a few hours ago--everything looks fine, but no clicks on menu items do anything.
I've been running Ubuntu 10.10 since it was released; 8GB RAM and a 60GB SSD. I haven't added any hardware or software recently except the Ubuntu recommended updates; the last thing was the bitcoin client a week ago.
The mouse works on other computers, rebooting does nothing, top shows 3 CPU cores free and over a gig of ram left. I don't know what else to look at.