Android users are usually pleased with their smartphones; however, sometimes, they complain about their phones switching fast. 
It's a strange situation to be in because you're momentarily using your phone and the next time it suddenly turns itself off, and when you happen to turn it on again, it functions properly, but only for a while.
Phones shutting down the problem not only delays your work but also tests your patience if you are in the middle of executing a critical task, playing your favorite game, typing one e-mail/message or attendance on a business call, and so on. We often hear Android users ask for solutions to this problem in different forums. If you're one of them and clueless on why my phone keeps shutting off, some ways can help you.

https://trilliontechng.com/why-does-my-phone-keep-turning-off-with-itself-tips-to-fix-it/