We have had to raise several cases with CA support where we were experiencing multiple issues related to 'broadcasting' between the app servers (14.4).
A couple of patches had been released (I am not sure whether it is covered in patch 4, 5, or 6) to address these issues. Once we had deployed patch 6, we saw this issue pretty much go away.
This was extremely frustrating as there was no monitoring being triggered through OnDemand to say that this issue with the infrastructure had occurred. It was only after we published updates to our configuration and numerous users complained that they could not see this config that we discovered there was an issue, and investigations through CA Support narrowed it down to 'broadcasting' between app servers.