If the bearings are the factory packed originals then you are asking a bit too much from the lubricant and bearing.

I would suggest replacing them or atleast repacking them after a good close inspection.

At your car's age the grease must be spent.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)