You’d be surprised what “works”. I’ve seen cable stripped back to 3" of center conductor and duct taped into an amplifier, no fitting at all, just jammed in there. Their Internet was “working fine” but none of the Spanish language channels were working, because they were carried on 99 MHz, same channel as local radio channels. But I was blown away the modem was locking on.

Absolutely. Water is getting in there as well as allowing low frequency ingress. That splitter needs to be changed out too. Get a tech out to change those out.