Cisco Switching/Routing :: 6509 CPU Utilization Showing High Randomly?

I have having two Cisco 6509 both working are my main Core Switches with which I have all my Layer 2 VLANs configured and then distributed thru the trunks links to all the Access Switches. I have L3- Vlans also configured on them with which one switch in primary and the other is secondary. All of sudden last night I got this message on my core switch 2 this for VLAN 1 which is my users LAN, how can I check as to what would have caused the core switch 2 HSRP to be active and then in standby

*Nov  5 23:33:29.296: %HSRP-5-STATECHANGE: Vlan1 Grp 5 state Standby -> Active
*Nov  5 23:33:29.796: %HSRP-5-STATECHANGE: Vlan1 Grp 49 state Standby -> Active
*Nov  5 23:33:29.804: %HSRP-5-STATECHANGE: Vlan1 Grp 49 state Active -> Speak
*Nov  5 23:33:29.920: %HSRP-5-STATECHANGE: Vlan1 Grp 5 state Active -> Speak
*Nov  5 23:33:40.144: %HSRP-5-STATECHANGE: Vlan1 Grp 5 state Speak -> Standby
*Nov  5 23:33:41.280: %HSRP-5-STATECHANGE: Vlan1 Grp 49 state Speak -> Standby
 
Also last night i got call from office saying that we are getting huge delay in pinging the default gateway of the user LAN which is the same vlan as the above and it was just for few minutes and then it was back to normal and now when I came to office and check there were no logs in both the core switches. When I checked the cpu utlization it was showing me high on both the switches how can I check as to what would have caused the CPU utilisation to go high all of suddedn?
  
INPMHCORS01#$                                         sh processes cpu his
 11111               11111          11111     1111111111
8885555588888666669999922222666665555511111777773333300000
100
90
80

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