Every single hardware piece has been replaced. No coax is used. The complete installation is inside the garage, it has always been there. No moisture/water seen/detected.
I had power supply problems before getting into the ADS-B bandwagon. I learned that lesson. 
Just to be sure, I went to check the RPis, I have two currently, the RED led is steady on, not flashing.
The two receiving ‘stations’ show similar performance. The minor difference is due to the antennas. The main one uses an FA antenna, while the other, a trimmed down RTL mag mounted on a pizza pan.