I do know but since it isn't in limp mode I would think it safe to drive. However it might mean your throttle cable is failing and may totally fail.which could be big.problem if in heavy traffic.
If mechanically inclined you might inspect the throttle stuff under the hood to see if.you can see a.problem. might be cured with some lubricant but probably not.
The problem should continue and likely happen more and more ... you should have it fixed. Seems to me any independent bmw repair should be able to fix this easily provided they can easily find what.is wrong.