Me too: multiple times a day. I also found a persistent intrusion from Cortana and One Drive (both I hate). When I looked, I found 6 Bots, and the last was named "JIHHADI". I can't delete it or, change it. My phone rings each time I reset my PC with either this number or the same other few numbers they call from. I don't know if it is serious or a prank, but I do know it changes my settings and security then downloads all previous computers since 1970s that everything that I have ever had on my pc. Then the phone rings when I catch them. I can tell they're at it again when I try to play Simple Solitaire from the Store apps. The screen does multiple brief timeouts, which alerts me. Microsoft denies that is possible. Now they won't reply to my request for a solution. This seems to be their biggest blunder yet. I hate WinX.