Always the case. I’ve an aftermarket bluetooth kit for my car that has a bluetooth adapter that plugs into the unit. Few months ago the right speakers stopped working so I took the door card off to investigate, couldn’t find any issues so checked the cable connection. It had come lose. Shoved it back in and sound was restored. Then last weekend blutooth wouldn’t connect. Tried everything, removed the device on my phone and tried to reconnect. No joy. Checked the cable. It had come out. You think I’d have learned from last time. It’s not really a fault it’s just as the device heat cycles the cable edges out like a Caterpillar.
having suffered a fair few R/R & stator fails in my time the first job i do when i get a new bike is to fit a volt meter so i can see whats going on