There's a good write up on that on e38.org (I think)
but there's a few ways to fix it..
replace the cable
heat & remove part of the end of the cable & replace the cap.
cut out part of the middle
basically what (typically) happens is that the cable "expands" and then the
interior cable appears to shrink & pull out of the gear/motor so it slips
&doesn' traise lower...
You have to pull the seat to fix it.
There's a guy on ebay that sells a service to fix it for a few hundred..
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