The group that I run with completes vMaw 2-3 times per week and has been doing so for the past few months. However, after the Murkmire patch we cannot beat the final boss since 2-3 players would disconnect every single time we reached pad #3. At first we thought it was just a coincidence, but after spending over an hour it became clear that the disconnects would happen as soon as we'd reach pad #3. This completely broke the trial for us since it was random who would disconnect. Sometimes it would be 3 DPS, or 2 DPS and a tank, or both healers.
Before the patch if we were unlucky we might have gotten 1-2 disconnects during the entire trial, but now that we're getting at least 2-3 at the same time every time during a specific fight makes it seem like this is a bug rather than connectivity issues.