I am using samsung m30s and from lastcouple of days facing an issue of auto restart and completly shutdown. Kept my phone is safemode for couple of hours but still issue persist.
It's a known issue with M30s and many other samsung phones with Exynos 9611 processor. Samsung service centre will diagnose as faulty motherboard and quote you upwards of 8000 for replacement. I took my M30s to a local skilful mobile repair technician. He did an emmc reboiling a few times until the phone stopped bootlooping/abruptly restarting. Sadly this issue generally comes after 1-2 years of using when it's out of warranty. After 5 good months of stability the hit this issue again. I decided to move on.
We acknowledge your query and apologize for the same. We request that you kindly visit the service center for a physical inspection of your device. You can locate your nearest service center with this given link: https://www.samsung.com/in/support/service-center/
