Transfer box failures are not restricted to Antaras. A wide range of manufacturers (e.g. BMW, Mazda, Land Rover, Porsche, etc. etc.) suffer the bad publicity associated with these events. Reading the posts from others over the years I have learned that:
1. checking the fluid level is not part of a standard service with a VX dealer (I always request it with mine).
2. only the recommended GM fluid should be used - there doesn't appear to be a published alternative..
3. some workshops believe that the box is a sealed unit and cannot be treated (it isn't) and a member previously posted a technical illustration of an Antara transfer box showing the drain and level plugs. He also made a case for what is described as 'pump rub'. https://www.dieseltechmag.com/2013/08/what-is-pump-rub
4. some manufacturers believe that odd tyres on the same axle, even just with different levels of wear, can contribute to transfer box failure.
5. although termed 'AWD' these vehicles are not designed for off-roading.
6. if the warning symptoms are ignored the failure will be catastrophic (repairs are bad enough in terms of cost).