What I do is make a selection and hit NUMPAD ‘.’ to center it in the view. This has a way of resetting scale factors for zooming. I have to do this in other packages as well, due to the same issue. Remember that if you have one point selected, it will only center, but with 2 or more points it will center and zoom all the way in to the extents of the to points, since it has a reference to work with. I hope this fixes what you are dealing with, because it sounds like you’re running into zoom limits, and this will reset them.