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The larger version of Samsung's flagship phone. Released March 2018.

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Why does my phone keep restarting?

At first it only restarted a couple of seconds after the screen was off. I tried to fix it by trying to update my phone, restarting it manually, and deleting some apps. But now it just turns off randomly every couple of minutes. It just started today, u don't know what to do.

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@gus_gush since it appears to become more frequent, you want to start off with a new battery. If nothing else it will provide you with a known-well starting point

Samsung Galaxy S9 Plus Battery Replacement

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Hi @gus_gush

Does it do this with the charger connected?

Things to try and see if they resolve the problem:

  • Wipe the cache partition and check if that resolves the problem.
  • Try starting the phone in safe mode and check if it works OK. If it does then a downloaded app is the cause of the problem. You will need to uninstall each downloaded app one by one and then test the phone in normal mode between each uninstall to see if the phone works OK or not. When it does work OK then the last downloaded app that was uninstalled was the culprit. A downloaded app is one that you downloaded and installed on the phone and it wasn't pre-instaled on the phone when you first got it.

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Its not doing it when my phone is on the charger

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@gus_gush

Then I suggest that the battery is replaced as recommended above by @oldturkey03

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