Participants continuously losing connection

Our meeting room has worked well in the past. BUT, the last 2 weeks, we've had participants being booted out or losing their connections. Today, we documented one participant losing his connection 6 times in the first 15 minutes. He has downloaded the update--matter of fact, we had everyone update their app. The connection testing went well. We had everyone turn off their webcams--and everything else they may have opened--to reduce bandwidth and we continue to have issues. We even had some presenters that contiuously lost the video button and had to reboot. This was a horrible day. Anything else?