Suspicious WiFi connection detected

The Sophos app on my android phone gave me a security warning saying that:

Suspicious WiFi connection detected

We’ve detected suspicious behaviour on your WiFi Connection. This might be caused by a public network requiring authentication. In this case, open your browser to sign in.

I have reset my home Wifi password but I still keep getting the same message. Can someone advise what I should do? 



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[edited by: Qoosh at 7:31 AM (GMT -7) on 17 Jun 2022]