DFS Replication Schedule Changes

Hello

We have deployed some 2003 R2 Servers and setup DFS to replicate some data from our plant sites.

We set a schedule for 256k during non-working hours and 64k during working hours.

What is weird , on a few occasions now the schedule changed to give FULL Bandwidth to DFS, what is weird, this has only happened on 2 of the sites..

Anybody seen this before or if it may be due to an update from Microsoft.

Thanks