Windows Explorer Error?

This has started to happen recently and never had a problem before.

Sometimes my router disconnects and reconnects on its own and i get the icon with the two displays on the bottom right of my screen that says that a cable has been disconnected and then everything connects again.

The problem is that every time this happens i get a "Windows Explorer experienced a problem and had to be shut down" error... This has nothing to do with Internet Explorer.. Its Windows Explorer... And every time this happens it seems like windows are having a mini-reboot..

Can someone please tell me what can be causing the problem and how i can fix it?

Thanks

Windows Explorer Error?windows vista ultimate

If you have mapped network drives, this may happen.