Problem with Lazy Pull Feature

Having problems with lazy pull feature of EMS. I can get streams to work using lazy pull with current documentation, but I am running into a problem with vod streams shutting down after a few minutes. It almost seems like EMS has a timer that fires on some schedule which closes out the connection. At first I thought this was an rtsp session timeout issue, but after closer inspection I do not believe this to be the case. I get get a stream to run beyond the 60 sec default session timeout for Axis cameras, but after 1-3 minutes the stream always stop and it always stops at at the beginning of a minute. I have a 3000 stream deployment that we would like to use lazy pull with, so any assistance with resolution would be greatly appreciated. -Bob-