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Have you installed any 3rd party apps lately? Usually those are just ads and it is recommended that you don't download whatever apps they tell you to.
Hi RikMoon
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I would have to agree with Alexdon on this one, this will likely be from a third party app or from a website you are currently viewing.
I can only suggest removing any third party apps that you may have downloaded lately, or any apps that may have been installed around the time it started to happen.