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I went through exactly the same thing. The first two trips to the dealer they replaced the VANOS solenoid per the SIB. The third trip they opened a PUMA case with BMW tech support. Your dealer should do this. It may help to reference PUMA case 13859843.
The end result was:
"Replaced Crankshaft Center Hex Bolt, washer for Crankshaft Hub Unit"
"Replaced friction rings on Oil Pump Drive Chain Module"
I have no idea how these could possibly relate to the VANOS solenoid but everything has been fine now for 1300 miles (and it was only about 100 miles between the second and third trips to the shop).
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