I just got a new T410 with Win7 64bit Ultimate several days ago. Everything was fine when I setup it for my client. But yesterday we found its ethernet adaptor would lose connection on a regular-yet-random basis regardless of the network I happened to be on. We can see the ethernet lights (both green and yellow) will off/on intermittently. So we have problem with the wired ethernet. The wireless works fine, no problem.
We tried to uninstall and install the ethernet driver which is downloaded from Lenovo website. But it doesn't help.