DO NOT switch to a lower octane as your N55 motor will run lean.
I too have a feeling that this is a Fuel issue. Next time this happens press the BMW Assist button so that it sends a diagnostic capture of your X3 to your respective service department.
Hopefully this will give them some more info since they cannot replicate it.
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2008 335i 6MT - Dinan tuned stge 2
1986 325es - SOLD
2012 BMW X3 35i AW on RB Msport - JB3 @ 4.0PSi over stock, 20x9F and 20x10.5R Stance SC-5ive, H&R lowering springs. - SOLD
2006 BMW 330i - //M rep kit with custom exhaust, H&R springs, 19" VMR - SOLD
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