For the last day I've been receiving pop ups on my phone regardless of where I am on the phone. If it's locked the code pattern will pop up asif it's trying to activate my phone. I've not installed any new apps recently other than the jurrasic world AR game. The only difference is that I'm connected to a foreign network and I'm overseas currently in Spain, usually from the UK. The pop ups are showing as appearing from YouTube. I've disabled the YouTube app and notifications but it's still happening. I've run a security scan using both the built in software and AVG but it's saying the phone is clean. I'm using a Samsung galaxy s8, unsure of version but there is a linked image. Any information on what causes this or a fix would be helpful. Two of the images below are displaying how the ads are appearing on the phone