I found the answer to this in another thread. Check your connections tab. Click on each individual host. Hit "browse host" at the bottom. If an error message pops up it is bad. Click "remove" and it will automatically find another one. Another user said a good way to tell if they are bad is if the numbers are almost exactly the same. My bad hosts were 204.11.219.232 and 204.11.219.229. After I got new ones my searches started working fine again!