Not just BT
I deal exclusively with home users. It's been a tough week explaining where the restart button is. So far this week:
20 on BT. 5 on TalkTalk. 2 on Sky.
(EE have also put a notice on their help pages).
19 had McAfee installed. 2 had Avast installed.
Most of my customers were blaming their ISPs, some have had other technically-minded users waste hours tinkering with settings - until I explained it was more likely to be Windows 10... something is crashing and due to the 'fast boot' feature, a shut down won't clear it, whereas a restart will. It's been a long week.