Update on my gearbox
BMW diagnosis concluded that the torque converter had to be replaced. For the next five days after that diagnosis the torque converter did not lock up unless I restarted the car, then after that it appeared to work normally.
The dealer replaced the torque converter as a result of the diagnosis and so far after two weeks it is still locking up as it should.
The previous torque converter took just over a month to start showing problems so if this one can go for over two months trouble free I will start to conclude that the problem is fixed.
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