My phone this morning showed my that my Android system is down, how do I fix this?

[AC Question]

my phone this morning shows

phone showed android system ui is down, Now its dead. on charger all night. I woke up to this. [phone number removed by Moderator]

 

[B. Diddy]

Re: my phone this morning shows

Welcome to Android Central! Which phone? What was the exact error message? Android error messages don't say that something is "down."

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