I had similar issues in my 2018 X1.
As my vehicle was still under warranty, I took it to dealer for service.
BMW tech was unable to pull any fault codes. Ran Idle Speed Control Test Plan.
Per the test plan, performed intake smoke test. No leak found.
Per the test plan, performed misfire detection test plan. No mechanical fault found.
Test plan then stated that “new software is available to improve engine performance”
Programmed the vehicle, haven’t had any problems since.
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