G3 launch message topic

Hi, well my lg g3 32gb running android 5, this happened before i updated, every time I bootup my phone, it does what its supposed to with the lg logo, and then suddenly after 10-20 seconds, a message pops up saying android is upgrading, followed by a black screen, loading up the home screen then the lock screen. I think its developping a fault. Its not rooted, used to be, but been unrooted since i updated to android 5