Every 3 weeks or so performance drops dramatically, to the point opening simple Word/Excel documents from it can take 30-40 seconds. If I reboot it from the web interface, it's fine again.
I use Seagate 24x7 NAS drives in it, and it really is used purely for file-sharing (no add-on apps, no streaming etc).
I'm on the latest firmware (keep it up-to-date regularly).
