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VPN Concentrator 3000, Memory resource critical

Below is the version

Cisco Systems, Inc./VPN 3000 Concentrator Version 4.7.2.J Nov 02 2006 17:43:54. The current image file is vpn3005-4.7.2.J-k9.bin.

Getting the below error message in logs

14510 07/13/2007 11:02:30.130 SEV=3 SYSTEM/14 RPT=1093

Memory system resources are at a critical level!

If I go to memory status page, its giving the below status

memory resources are critical, new IPSec, PPTP and L2TP connections will not be accepted.

Total Memory is 64MB

Before reload total Block usage 48%

after reload total Block usage 33%

All the new VPN connections got rejected. It all started working fine after rebooting the concentrator. Is there any other solution other than rebooting.