Black screen flashing blue light 5 sec can't find app or notification causing

[AC Question]

s6 active current operating system

 

[AlphaTango414]

Try booting into safe mode, does it still do it?

You can use the same process here to help you figure out / fix your issue. Malware / Adware Removal

 

[rmnwlf]

Check your Gmail, turn off notifications through Gmail.

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