Probably it was serviced according to BMW recommendation - means never, since it is filled "for life"?
If so, it is probably reaching its life..
You can try to flush it 2- 3 times (single flush replaces only small portion of fluid - the majority of it is in in torque converter), replace filter and couple seals and hope that this will help...but also be ready mentaly and financialy for new/rebuilt transmission
I've just replaced by box with a rebuilt one as mine shredded inside! Cost me £800 for the box nearly 200 for oil and filter then £150 to get a family friend to fit it at his garage, try getting it serviced
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