From last 4 months my samsung m21 mobile have hanging and auto restarting problem. I have change motherboard but still my problem is not solve.

Visit to service center or mail to samsung head office.So many m series user have same problem, I read reviews on Amazon, you tube.I am facing problem from 2.5 months.My hand set in warranty so motherboard replace in free of cost,but my problem not s...

If in warranty then to change motherboard otherwise buy another mobile.

This problem I told to service center technician but they unable to found problem.

In warranty it is free of cost