We are facing similar issue streaming from wowza, our setup is to play mp4 files from mounted S3 bucket as a LIVE application (simulated live feed). the stream plays very well for a while and then starts (between 10 to 30min) either rebuffering or stops. wowza access logs show events like(in order for roku)-- stop, destroy, disconnect, conect, create and play.
bbakernc, any more details of the XML file population with duration and standard will be helpfull.