I suspect the brick got too hot and the hotter it gets the less power in Watts and Amps it can pump out, reading a few tech documents on other brick power supplies.
So if the ambient room temp or the brick is getting really hot, this must be the failure point. I don’t think it’s the cable connection itself as it sits snug and doesn’t move or wobble etc…
The new replacement is a 120W and 10A so it has some overhead 