I had a message on my LG G4 that my wifi was being hacked

Hi please help. I had a message on my LG G4 this morning with a red warning message sating an attempted hacker was trying to hack my sky broadband and would I like to prevent it. I'm usually so careful with these things and ignore them then run a virus scan. But I thought it was a warning from my McAfee so I clicked ok. Now my wifi switches on for a second then turns straight off again with a connection failure message. Just to be on the safe side I've deleted all of my banking apps. Ran a virus scan which showed no threats. Any ideas how I can fix the wifi? Would a factory reset help?

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