CSm loosing connections every 4 hours ?

Hi,
We upgraded our CSm to V4.2.2 and for one of the VIP, it looses connections to the 4 real servers every 4 hours ! Anybody has any idea what could cause this to happen ? If I use IOS SLB, I do not have this problem...

Gilles,
The Servers's default gateway point to the MSFC. To get the MSFC to route traffic back towards the CSM when the servers reply, we NAT the connections on the CSM with a NAT pool. and have a route for teh NAT pool on the MSFC to send the traffic back to the CSM...
We tryed changing the arp timeout using the CSM set variable command but still same symptoms... We are using router mode for this one.
All connections to the 4 real servers disapears but the CSm does not report the reals as being out of service. I am assuming the problem is on the CSM but it could be the servers as well. It is just odd that the 4 servers would drop all connections at the same time every 4 hours...And by going back to IOS SLB and not doing any NAT, the problem goes away.
We're trying to get some packet trace to help out the troubleshooting...
Cheers

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