I would document this feedback / raise a ticket with support via settings>system>feedback in your settings app.
I would say that I’ve had a Nothing Phone(1) since its release and the charging port is still going strong. For this to happen across to of your Nothing devices I’d suggest looking at the wires you’re using but, also if you’re getting sand/grit/dirt into the charging port. I got sand into my Huawei Mate 40 Pro charging point and it caused havok for me, rarely charged.