Even on cheap devices there is usually a post either side of the USB port which goes through the board, on this it is just attached to the surface with a tiny bit of solder. Can't believe it lasted this long as it looks so flimsy, when it goes again I'll put some hot glue behind it, this might be a good preventative measure tbh.
I used one of those cheap $3 USB powered irons because I couldn't be bothered setting my main iron and power supply up for a 2 minute job, they're surprisingly good!