TheGrayWolf81 , via OnePlus 3 , Jan 10, 2020 : Hello. I have been experiencing issues in regards to notifications from the default Android Messages app from Google. Often I will receive an SMS message but I won't receive a notification or notification sound, leaving me unaware that I received a message. Recently, I have been receiving notification sounds but no notification is present anywhere. I have disabled battery optimization for the app but it yields no change. Has anyone else been experiencing this issue? I would like a fix because I am constantly missing people's texts, sometimes not seeing them until days later.