I have carried out extensive investigation regarding the relationship between wear on the top bearing plate and the other components.
Please let us be 100% clear on this... The mast bearing plate (and the ring it is mounted in) IS NOT DESIGNED TO TAKE THE WEIGHT OF THE MAST. Even a cursory look would confirm that no engineer would design a system where a weight-bearing ring is only supported on one side. The bearing plate(s) are there solely to support the 24 delrin balls with HORIZONTAL loads.
As an aside, I wonder if this might have been an issue with those very few crossbars where the weld holding the ring was showing cracks....
So if your top bearing plate looks like this below, go straight to your Hobie dealer, as this is a symptom of a problem. Remember also, that the V2 mast receiver/v brace assembly cannot be adjusted by more than one or two milimetres (basically be distorting the components), unlike the earlier versions. The fix might need a new bottom half mast, or a longer pin in the bottom of the mast receiver.