Yes, seems like a pblm with the rear hatch switch.

The whole assembly - switch and trim assembly comes out and can be repalced.
Part# 51137170840

But pull it out and see if you can see a problem with the switch

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'99 E39 528i 5-speed 130k
'06 325Cic auto 115k
'05 X5 3.0 auto 173k-SOLD
'03 530i - manual swapped - 430k miles - Parting