One thing I dont like about M51, that samsung artificially did not included support for 4G+ (hardware supports it). I tested speed using "speed test"app with my friend. We put phones next to each other, choose same server in speed test app and hit "Go" in same moment.
Some of the problems that we will be discussing include poor network connectivity, device freezing, and battery drainage. We hope that by reading this article, you will be able to troubleshoot these issues on your own, and get your Samsung Galaxy M51 device up and running smoothly again.
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/
