Wow, same here.
I bet this bug is going to cause a lot of random drama in relationships.
"Why'd you turn them off?" "I didn't." "Yes you did." "Look it's.. oh, it turned itself off." "Sure it did. You just want to be able to ghost me." "No I don't!" etc.
Same here. Just started notice since yesterday. I have restarted the router 3 times, which I never did for months. Still unsure whether this is coincidence or really due to the update.