[RhinoTourer]

I've just gone the other way, the blue connectors mount had broken so and I was getting the exact same issue.

I've just cleaned the contacts on both connectors and cable tied the blue back approximately where it should be. Hasn't come back on yet...

Looking at the pins in the connector and the length on the connection itself I would say the pins will only make a fraction of the contact inside the sleave that they really should as the male pin is so small it will just bend away from any point of contact over time.

It's likely oxidization on the female side that's causing the issue.

Maybe try soaking the female side in contact cleaner for a while and if that doesn't do it possibly try very very slight movement on just one of the male pins and then make and remake the connection several times and repeat if necessary.