I encountered this problem every night after my scheduled backup ( we are using wbadmin.exe ) has completed. It appeared 7 times in the application log, which coincide with the number of storage group I have. Naturally, the logs are not truncated and hence filling up my drive.
It all began after we have rebuilt our passive node Exchange 2007 server. We are running on W2008 Ent 64-bit with sp2 and the Exchange 2007 is also on sp2. The same configuration also applies to the active node of the CCR configuration.