Frequent state between agressive mode and calming down mode

I have a cisco 1841 router, on which ip inspection is enabled (IPS). The inspect max-incomplete for high is 500 and for low is 400. This is a gateway to an ISP (for internet) with 512K bandwidth. I get frequent transitions between aggressive and calming down modes, which is causing connection interruption. It was working fine, but it is happening currently. Can anybody help me with this?

Hi, please review this doc for a discussion of IOS Firewall and IPS DoS protection configuration:
http://www.cisco.com/en/US/prod/collateral/vpndevc/ps5708/ps5710/ps1018/prod_white_paper0900aecd804e5098.html

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