Yes had something very iffy. And not lurking either, it was brutal in its functions.
It was a DNS unlocker. I would call it a virus but BT say it is a Trojan and so not covered by BT net protection. Then they said they do not support windows 10. What a joke they are! I don't know why they did not say that they simply do not support problems period.
BT reset my DNS and then felt pleased with themselves for solving the problem. They did not even take a note of the number it had been reset to. Because for me that lead me to find others had been infected with DNS unlocker. It is a real pain of a virus. I ended up with advertisements all over the webpages and Mcafee posted Whoa do not go there messages for almost every web page. Including BT and BBC. Not exactly your typical iffy websites.
I prefer the chat lines because I log in as my husband so they think I am male but on the phone they detect a female and are very arrogant. They do not seem to be able to cope with anything you have tried already.
Finally got it sorted by going onto BT forum. Mcafee did not detect any problem, Avasti did not detect any problem. It took two more: Malwarebyte which detected 71 problems and AWDcleaner which found a further 15. And I had already found and deleted a DNS unlocker program. So in all I had 87 problems. Seems odd that so many problems were able to evade detection.
Though I believe some of these types of programs were developed for places like China and Turkey to be able to get access to blocked websites, so they are build to evade detection.
Not clear where I picked up the problems. Also have had to reset internet explorer which is a pain since it has lost all my passwords, so I have to reinput everything.
But please be warned BT net protection plus is a waste of space. Worse because you think you are covered but when something goes wrong BT do not want to know. And Mcafee just refer you back to BT.
Anyway I am now an unwilling expert in DNS unlockers. So if you are having problems with your DNS I suggest posting on BT forum. They have some real experts on there.