Well sounds like this is a repeatable flaw in that part... using the toothometer Im 90% positive that the connector part is not glass filled. Maybe some stress from moulding and a slight flex of the unit at some stage made it crack?

I contacted Nokia in December about it but got a reply telling me to take into a local store for fixing, and get a temp replacement from them.. This was when there was a huge shortage in the Uk so I didnt bother.

I have had the crack for about 2 mths now and it hasnt spread mainly because the crack has no where to go. This is how they fix cracks in aircraft panels - drill a hole at each end of the crack and it cannot propogate.

The warping in mine has got worse - i wonder if the strain from the warping made the crack appear?