Help with Automatic Transmission problem

I have a Nissan Micra 1.2, 2003 model. whenever I am driving the vehicle it would switch to a low gear and stick there. I would move the gear stick to the different gears and nothing happens. It only gets back to normal when I turn off the vehicle and restart. No one can say what is causing this. can someone please help me? I love the vehicle but it is having this problem.
 
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