Samsung — Samsung M31s heating and restart issue

My M31s phones purchased on 03/09/2021 keeps restarting during normal use of the phone from 16/11/2021. Sometimes it is stuck on the boot window for hours and will only boot if I keep it in refrigerator for a few hours. I went to the service center where I was suggested a replacement of mother board for my phone. they said it will cost me around 8k which is an exorbitant amount which I will have to pay even if its not my mistake. The only way I can keep the phone from not restarting is by using the limit apps and home screen feature in battery saver mode which makes the phone nearly useless. Brief research on the internet reveled that this has been the problem with a bulk of Exynos 9611 phones and there has been no solution or solid statement from Samsung.