phone shut down without any phone update

[Ocean_Waves_S21plus]

Yesterday I was watching a movie with my friend on my phone (S21+) and it shut down. Now normally it's just battery or update but I wasn't notified of the update. Also when I opened 'Members' after the update, it said my phone shut down unplanned (something like that) What's going on?

[Ocean_Waves_S21plus]

Someone help pls🥲

[lminvti]

Hi

It could be due to play store update, did it happened once or multiple times?

[Ocean_Waves_S21plus]

Just once

[BandOfBrothers]

To me that's sounds like a glitch @Ocean_Waves_S21plus however if this happens regularly then >

• Clear Cache Files from the phone's System Partition Section  > https://www.samsung.com/uk/support/mobile-devices/how-do-i-clear-the-cache-on-my-device/ You may need to insert your earphones or hook upto a powered On Laptop or use a Tv's USB Port to access the Clear Partition Section. This may help with lag or stutters as this clears the phone of old/unused or broken cache files.There is also a Repair Apps option in the Menu System too { Possibly excluding the s²⁴ Series of phone's } 

And as a very last resort back up and factory reset. 

If i can be of any further help please don't hesitate to ask  😎