It looks like the rear cv joint thing is stuffed. There are marks in the cage that looks like the bearings were moving around a lot. BMW want r3000 for a new one.
Went to Pretoria and got a second hand propshaft for R1400. Still looks to be in good condition.
Initially they couldn't find one. I was on the phone to bmw to order a new rear joint thing when the guy found one.
Will fit it soon and see if it solves my issue.