My son has an account for canvas through school. For the last three days, he logs into Canvas from his Chromebook and joins his Zoom meeting through the link the teacher provides. At random times, the screen goes blank and takes him to the computer login page (as if he was just opening his computer). It also does it when he's doing Jiji or Core 5 (other programs he uses for class). I've tried everything - different computer, different browsers, different internet connections. I've also tried logging in and out of Canvas. I've called and emailed our district tech support but haven't heard back. And this doesn't seem to be happening to any other students in his class. Any ideas or suggestions?