Sounds like you have installed an app that is pushing ads to your home screen or lock screen. You should review your installed applications and see if you can figure out which one it is.
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I have pretty much the same issue as the original poster. And your solution does not work for me I'm sorry to say. I had an HTC that won't stay on without being plugged in so they sent me a refurbished LG G6 and it came with so many pop-up ads that it's infuriating. And I haven't installed any new apps. In fact I went and deleted a ton of apps i don't need and i can't stop these full screen pop up ads. And the weird thing is they are for apps i have like google and waze etc. An interesting side note, i used the NFC to transfer my stuff from my htc to this lg and now my htc is infected with these popups. Super frustrating!!!
Mr247, we know how frustrating it can be to have adds disturbing you while you are using your phone. Let's go ahead and get this worked on. Have you tried turning off restore applications and doing a factory data reset of the phone to see if that stops the ads from popping up. If not, can you try that and let us know what happens?
I had the same issue begin today, and none of the dozens of trouble-shooting tips worked. Until this one....
Find out which app has most recently been "used"
1. Go to Google play store
2. Tap Menu (the three lines on the top left corner)
3. Tap My apps & games (on some devices, you will need to choose apps & games first)
4. Tap Installed to see a list of installed apps
5. The Installed apps will show in alphabetical order by default. Tap the lines next to 'Alphabetical' to change the sort order to 'Last Used.'
I saw that a random alarm clock app that I hadn't used in months had just been used. I go to the play store to check out recent reviews, sure enough 2 other people reported that yesterday's update now caused full-page ads to show up constantly. I uninstalled it and have been ad-free since! I also reported it in the play store. (Go to the install page for that app and select "flag as inappropriate> Other". It'll give you the chance to explain why.)
I followed your advice. I've been getting ads almost every time I open my phone. Very annoying! It showed I had used my flashlight app recently (I haven't). Once I uninstalled it, it asked if I wanted to reinstall it. "Contains ads" was right below tihe install button. Thanks for the tip!