Recorded FLV just stops after a random time

Hello:
I have some long (1 hour or so) flvs recorded from a small flex app communicating with FMS 3.0.0. It is mostly audio.
When replaying them from
- a client Flash OR from (Method A)
- FMS and then have a Flash client connect to the FMS Live stream (Method B)

The stream just stops after a while (variable: could be after 2 minutes or 20 minutes). It is very reproduceable which makes me wonder how come others are not getting this as a google search does not show other complaining.

I get an Unpublished and then Stop status on the Flash Player for the stream.

Strange thing: If I play the stream direct from a player (Method A above), then the higher the BufferTime and the longer it takes to stop. With a buffer time of 5 seconds, it plays without stopping.

I actually need to run it with Method B. Setting all kind of buffers on the server produces no noticeable results.

Any idea?
I can send you my simple test codes for Flash player, FMS and the flv if need be.

Thank you