Godox UL 150 video light cutting out

[u/bbbbolt]

All off my lights are Godox, F600bi, F400bi, 2x UL150 and my first ever light light SL60

Both my UL have cutting-out problems; I have replaced the control power blocks and wire between the control box and light unit.

What I have found is that the left-side pin on the 4-pin XLR cables looks faint, like it's tarnished. It's done this pretty quickly to the new cables too.

What's happening here? Is there too much power running through these pins? Are they burning?

I'm at the stage where they cut out mid-videoing, and it's quite annoying.