Guys, I have a problem with my elegance auto gearbox.

Any owners here experience this before.

Hopefully if need repairing the bill won't be too expensive 

Copy paste from the F&F column below:
Just now was parking my persona, after reversing than i shift back to D to move forward.

But the indicator on the meter panel still showing N even though the gear stick is on the D position.

I thought maybe error reading at the meter panel and try stepping on the accelerator but the car could not move.

No choice so I engage to 3rd gear and the car move.

Few hours later after shopping went back to my car and this time everything seems normal.

And then the same issue happened when I stop at the traffic light.

This time from D I shift to N but the meter panel reading still showing D and the car moved if I let go of the brakes.

This is the first time happening to my persona.

Not sure what is the problem and hope for advise here.

My model is a 3 year old persona with 4 speed auto gearbox. Mileage less than 30k

is it normal, the radiator fan still running (to dissipate maybe extra heat) after ignition is off and why the coolant level at radiator keep decreasing especially I on long distant drive. Is it normal?
How frequent I need to top up the coolant? Is it normal if I need to top up every once a week
FYI my auto PE is 8 years old

oh man, suddenly my car cannot start and alarm and tek2 sound is getting crazy all over. Just replaced to a new battery about almost a week ago, Mind to share what is actually happening here. All good about an hour before that, just realized it when I wanted to move my car under the garage.

I changed my XM2 after 120k km mileage.