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    SG560D cpu usage locks up unit running latest software....

      I have just installed a new 560D into a new remote site.  Configured the same as the 3 others I already have in place.  It appears to be very unrealiable in keeping the IPsec tunnel up.  Thought that it could be version conflicts, so upgraded all units from version 3.....to 4.0.7   Now I have gone from having IPsec tunnels with 104 day up times to barely keeping them alive for a 6 hours and also problems with the DHCP functions of the units at the remote sites.  The unit graphs 100% CPU usage and no longer functions reliably.  I am thinking about downgrading all the units again.  Nothing but a pain doing upgrades for things that work.  Any suggestions??

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