Samsung m21 mobile have hanging and auto restarting problem

[kkapil1]

My samsung m21 mobile have hanging and auto restart problem. Samsung service center technician unable to found exact reason. 

[prashantpophale]

Same with my M31
Hard reset two times
No benefit

[Lekshmanan]

If Frequent Restarts , Your Device Need Replacement Of Motherboard.
If ur device in Under Warranty its free.

[kkapil1]

I have already replaced motherboard but still my problem not solve.

[Chanakya_Reddy]

Try factory reset, if it doesn't work Don't waste money on replacing motherboard again.
Buy a new phone. It is best choice

[prashantpophale]

How much it cost to you or in warranty.

[kkapil1]

In warranty it is free of cost

[prashantpophale]

If you replace whole motherboard,
Why not working properly.

[kkapil1]

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

[prashantpophale]

I am also thinking about to change motherboard of my M31 phone.
Now confused.