For some reason when I tried to start a video chat the session was playing quite slow or with popping up mistakes. This was happening in both Firefox and Chrome. I couldn't fix the problem myself and because of the bug, I had to stop the session and start it again as I could not simply type the message normally, every other second I was interrupted by the popping up window notifying me about the problem occurring on the page. I did write about this to the support service and they fixed the problem. It happened again in a few days, but this time it was fixed immediately after I reloaded the page with the chat.