Signal strength of -104 dBM indicates that you have a problem somewhere, either in your neighborhood due to overcrowded frequency spectrum and/or settings or a problem with your TO. First thing I would try is removing the anttena’s, opening the TO and disconnect and reconnect the wifi cards, closing it and reattach the antenna’s again.
A very rough table of dBm values (ripped from Metageek)
< -90 dBm - Unsuable
-90 - -80 dBm - Not Good
-80 - -70 dBm - Okay
-70 - -67 dBm - Very good
-67 - -30 dBm - Amazing
Can you give more information about your environment (router placement, type of house, etc) since without this information we cannot deduce what and why it is happening?