Tonight is the only night I can polar align the mount before I go back home.
So, here's what happened this afternoon/evening:
Front roof closing switch is no longer working so the driver thinks the roof is always closed
the QHY5 decided to stop working
the Atik 314L+ decided after 30 min to only send me a white image
Yes it's a limit-switch hardware.
I have a spare one with me, so I can swap it but I have no voltmeter here to check what's going on really.
It may be that I have upset a cable the other day, who knows. Or maybe some water got into the switch. I'll check it out tomorrow if weather permits.