@penguin86@social.ichibi.eu if there's any vibration on those wires (and they lead to a speaker) the stiff point of the system is the part of the wire with the solder infused on it. So that's the likely failure point. I crimp jst-xh's for this, specifically that size because I have a big selection box of them assorted, and dont have dupont crimpers or ends. Also very guilty of the crime of just pushing the wire through a pad and soldering it when space is tight, but this is prone to this failure too.