I use my Time Capsule to share files across my machines.
On my MacBook, when I open the shared disk in Finder, and expand some folders, it starts to "refresh" after a few seconds again and again.
If I click on a file, it loses the selection, and the directory tree disappear and appear, like being unmounted and mounted quickly.
Edit: I realized that what was causing that was some folders with accent in their names (like: Música). Once I removed the accent, this behavior stopped. Is this a known bug?