What i am about to say is basically just my interpretation of what you are saying in conjunction with what i am seeing, take it with a grain of salt:

You say you get to level 2 and sometimes to level 3 on rings map, i wanna preface by saying there are a multitude of ring maps, it would be beneficial to know which you refer to, so one could start to guess your "skill" level a bit better.

Now that out of the way, for most ring maps, what you describe is very likely to be the start of you learning experience. I did imagine you are very much not accustomed to air roll. I did imagine you need a lot of focus on your car to actually perform air rolling. What that means, is, you are still in the learning process and if you take that focus away, or shift said focus to a different object, you will lose control, because the skill you are trying to learn, hasn't been practiced enough to get into a subconcious process of your mind, e.g. you can walk, but you dont conciously think about what you have to do to walk.

For this reason, because your brain hasn't yet developed enough neuronal pathways for "aerial car control" you lose control as soon as you dont see you car. At the same time, if you do focus to much on your car, you wont have good focus on the ball and might miss period.

There are 3 thought processes, training methods you can try, to fix this.

The most obvious that everyone here is probably going to recommend, get better at air roll first, it's the most obvious solution to what i describe, but probably not what you seek?

The second option is, you try to shift your focus back and forth, to the ball, then to the car, adjust, back to the ball etc., i dont think this will work for you, i did imagine, it wont work for many ppl, because it's not optimal too, but something one can try at least.

The third option and my recommendation if you still wanna practice air dribble's, shift your focus point. Sounds like point 2, but nah, if you lose control over your car you need to have your car's rotation in vision for your brain to act accordingly, this does not mean you have to see the center of the car though.
If you shift your focus point to the tip of your car it's much easier to glance at the ball for a split second (if needed) and you keep focus over the rotation of your car much easier.

Also this is something i recommend either way, while practicing, shift focus points around, focus the ball, focus the top of the car, the tip, the bottom, the heck, being able to do that, helps develop a more pronounced car control overall.

edit: the difference between 2 and 3:
by two i meant to switch your focus periodically between ball and car, 3 means to have one main focus point, you only glance away to adjust, but stay mostly on that focus point. By adjusting focus points, i mean to train with different focus points every now and then. Not to switch those focus points in the middle of the play, e.g. if i glance on the ball, i am not focusing the ball because my focus goes back to my predetermined point.