In some test calls, there was a sudden onset of 10 seconds of delay in a webrtc call. Having the other side leave the apprtc call and re-join did not solve the problem. (With apprtc, this means it was a new call, but was using the same getUserMedia stream.) Having the sending (delayed) side exit apprtc and re-enter fixed it (which matches). However, we later had a circa 1 second delay (not sure if it was sudden or not) and the sender (delayed) side un-muted the local image, and they heard a 1+ second delay on the gUM stream/local media, which also verifies the delay was either in gUM or in the MediaStream