Your comment reminded me of a similar scenario with my Windows 10 PC. One day, I saw lot of computers (100+) listed in my network when I went to network places

Your comment reminded me of a similar scenario with my Windows 10 PC. One day, I saw lot of computers (100+) listed in my network when I went to network places through Explorer. My laptop was the only one in my network. I don't know if it was a bug in Windows or if my PC was actually part of some unknown n/w. I suspected dd-wrt in my router and immediately went back to manufacturer firmware and formatted my laptop. Never saw that after.