On random Mac OS devices running Mojave (any version):
SOCKS proxy is automatically re-enabled after every reboot/power cycle.
By default, no proxy settings should be configured.
The proxy is configured with: localhost port 8080
This causes all email apps to go offline intermittently. Also it causes all web browsers to become "unable to load" any web page.
Once the proxy is manually disabled in Network Preferences; everything works fine.
How do I disable permanently?
Why does the SOCKS proxy auto enable after the device is power cycled?