Viruses on Samsung S9

Hi, I think I have a virus on my phone (Samsung S9). Internet pages open by themselves (English pages) when I use my phone, whatever application I use (messages, camera, gallery, internet browsing etc). I’ve tried several “cleaning” techniques, with no success. So I completely reset my phone. It was fine for about a week then I feel like I have a virus again. I do not know what to do 🙁