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CatOS Port Security Bug???

We use several Dedicated Micros digital video recorders connected to Cat6509 switches running CatOS v8.5(9). we also run port security on all ports with the following configuration: set port security 3/36 enable age 1 maximum 1 shutdown 1 unicast-flood enable violation restrict

The security staff will watch these dvr's using a web based viewer and the video on the viewer will lock up consistantly, after it locks up you can start it again and it will run for a minute and lock up again. I noticed in the switch log that it will lock up when the aging timer expires. This is the log entry I see when the video locks up: 2009 Jan 23 07:17:41 CDT -06:00 %SYS-6-CFG_CHG:Module 3 block changed by SecurityRx//

This problem seems to be only on our CatOS switches. Anybody have any ideas?