So, last week was very problematic for me. suddenly in morning my phone hung in bootloop. After  10-15 min, phone rebooted successfully. Later, when I tried to turn on phone's wifi, again phone is started doing rebooting continously.

I could not recovered after that, I was waiting for battery to be drained completely. After battery is drained completely, I though I will connect to laptop and start wiping cache and factory reset but my phone never went into recovery mode. Also, I tried to update google play store, still it didn't help me.

At last I had to go to Samsung service center where it was found out that my M-board is damaged and need to be replaced.

I got my phone yesterday with m-board replaced and now it's working fine. Not sure, why this issue happened.

Again, the phone is asking to perform One UI 6.1 update and I'm scared to do. Any suggestions ? My phone is still in warranty.