Replying to Problem with mobile ns, spam sites/virus?

Anyone else gets re directed to spam sites when browsing ns on mobile? Dosen't happen all the time but its happened like 5/10 times the last hour. Not sure if its NS or my phone its something wrong with, my phone is an LG G2mini and I'm using chrome.. Attached some screenshots of what comes up, the last image says that the last page I visited infected my phone with a virus and I need to click ok to start the repair process