Hard to say from just this image, but a short connection drop is possible. You were still connected to some users, so it is not all your fault. (edit: unless ice adapter where still in process to reconnect you to the users again - you can monitor the ICE adapter debugger to see what was going on)
To narrow it down, you will have to monitor your network for interruptions, packet loss and timeouts. E.g. running WinMTR while the issue happens, and looking at places like Windows event viewer for anything unusual.