Echo has recently gotten worse using Adobe Connect Video Chat app

Our company runs an Adobe Connect Video Chat application. It has been active since January 2012. Currently, we have about 80k active users. We have never experienced much echoing until the last 90 days. Now, all of sudden there is a pretty significant echo happening randomly in about 70% of the calls.

We can clearly tell its the speaker looping back into the microphone of the computer. However, the Acoustic Echo Canceller has always done a pretty good job of reducing/eliminating it. Has anyone else experienced a recent change in this? Possibly a new version of flash that is not cancelling echo as effective as it was? We are currently using Flash v23.0.0.185