I have been successfully downloading files for the last few days with no problems, but every once in awhile and now all the time, the "sharing files" dot is red indicating no files are being shared, when I initiate a search in one of the fields the "search" button will not become active, and at the top of the window it indicates "LimeWire: Running the Gnutella Network (Disconnected/no files available.)

What am I doing wrong?