Maybe the voltage dropped below the minimum threshold for L2 under load as the connection got hotter so the onboard charger shutdown.
Regarding crimp vs. solder: Crimping is faster under assembly line conditions and should be more reliable with properly-adjusted automated crimping tools. Unfortunately, Rema/Blink proved that is not always the way things happen. Soldering makes a good connection when done properly so it is certainly worth fixing a cable at home if the wires and pins are not damaged beyond use.
Only one of the cables I have used had a burned connector. That made soldering more work. I had to scrape the cable bright. This was only on one pin. Blink's downgrade is proactive since they had no way of knowing which cables had a bad crimp. Most that I have seen are OK. Soldering is just a precaution. Tony's cable was specially selected to burn up.
I think if I was a technically challenged owner I would just replace the cable and J1772 connector. At the same time you could extend the length. When I upgraded to a 24 ft cable I no longer had to back in my Leaf. It does take years of soldering to get good at it. Tony's cable is a good replacement. And it is available in up to 24 ft at full ratings. Longer derated,