Well this is frustrating. Been trying to diagnose the issue. Nothing yet. Every time my wife comes back from a journey no leaks on the driveway.
But just today she sent me a photo of some coolant spat out after she parked. She thinks it's under the area of where the coolant reservoir is.
She had the AC on so maybe the system got hotter than normal in heavy traffic?
Told her to check the reservoir and top up if low before she leaves later to come home.. Not to turn any ac on also.

May have to book it in to the garage which I hate doing. Feel defeated so far.