lg flex random ads

[AC Question]

Why does my phone lg flex keep popping up random ads every time i unlock my phone? And ill find random apps downloading by themselves throughout the day. And yes i've tried just about everything you can think off, master reseted it a few times even. Haven't even downloaded apps for any occurance to happen? Is lg just really this bad cuz on my old lg g2 it did the same thing bought it brand new and ran fine till it made me do a update when i connected to wifi, it started doing random adds as well after that update. And yes it was a actual lg update