Old thread I know, but…
One thing I’ve noticed is that if I turn the router to it’s lowest setting prior to turning it off, I don’t have any disconnect problems. That makes sense since you’d have less of a voltage spike when turning it on and off. Something to consider.
I’ll have to grab a cap for my machine (still under warranty, but easy enough to get) will probably make it so that I can plug it in instead of soldering directly to the pins.