Full screen ads appearing on phone

[Isitjustmeoranyoneelse]

Every now and then a full screen ad is popping up. The X button doesn't work on it. I'm using an android phone and it's happened in Chat and AIBU

Hi @Isitjustmeoranyoneelse

Thanks for alerting us to this ad. Can you remember what the advert was for? If you're able to take a screenshot next time it crops up, that would be really helpful.

Can you also please let us know which browser you're using.

Thanks in advance