I developed a similar issue last week and after every 12th hour or so, as I observed, the FlightFeeder is not able to track satellites. MLAT and ADS-B reception stays unaffected.
However, whenever I reboot the FlightFeeder, or after leaving it in the same status for an hour, the issue isn’t apparent. I do not suspect antenna fault. There were no loose connectors. Similar to INDR4N1L, the height was increased five feet but on the same mast. No location change was made.