Samsung — Samsung m31s mobile restart issue.

I have been using my samsung m31s mobile for past 2 years and i have faced many software bugs. A week before my phone had random ringtone playing all of sudden so i called remote support and complained about it. They made some changes and but after then my mobile gets restated again and again .
I complained to the offline service center too but they responded saying most of the m series phones gets these issue .Such a shame on Samsung India, it is clearly visible it a problem on the company's side but they are not recalling their products or not even providing service for it without charging fees.It costs about 8500 Indian rupees to change motherboard which is their
worst product quailty.