In our elementary school the kids are asked to use jitsi. This night at ~ 4:00h the jitsi app started itself with a conference. I do not know what it caused. It ran for ~ 4hours until I took the tablet to check for the latest homework for my kids. Camera on. I do not know if mic was on as well.
The kids couldn’t have started it because I keep their tablets after they finished their homework, high in a bookshelf.