Yall are missing the forest for the trees.
I've had this same thing happen with other "powerbars" outside of GHL as well as my previous GHL powerbar. It's a fault in the PLUG and when it goes south the SOCKET is the victim. We always "THINK" it's the socket at fault and the PLUG is the victim but it's the other way around and it's across many brands of heaters. I feel like what we are seeing is inferior components in the HEATERS and/or less than stellar QUALITY CONTROL! All of this has happened, to me, in the last 5 years. Before that, I don't ever recall the PLUG or SOCKET being an issue in any of my tanks.
I had this happen with a very old NEPTUNE system as well as an INKBIRD and a GHL. All were faulty in the PLUG and then the SOCKET was ruined as well.
@Vinny@GHLUSA can you expand upon this some more?