Feature failing when making current feature

Hello,

Sometimes, when modeling, a few previous features fail when I move to a previous point. For example:

1. I have the part completely modeled with 300 features.
2. I make current feature the feature number 200.
3. Features 100,115,119,140... fail.

That makes no sense to me, since the model did not change before feature 200. Why does it then fails? Does it happen to somebody else?

It is annoying to keep fixing all these features every time this happen.

I've realised that some of these features that fail are substract where there are two walls touching without distance and similar cases. Anyhow, I didn't change tolerances or anything.

Why, also, is NX updating features before feature 200, if I am just going back from 300 to 200?

Thanks.