DHCP HA in Cisco switches 6504

Hi - We have 2 Cisco 6504 switches configured as DHCP server to provide IP's to data and voice network. Both switches are configured will full IP subnet scope and it was working fine since 6 years but now suddenly it stops distributing IP addresses which works only after we clear all arp from both switches and disable DHCP on second switch.

Sometime its stops giving IP address only for voice network even though many IP's are free for distribution.

Well we can split the scope to half between both switches but IP conflict was never a problem, i believe cisco ios manages that not to assign same IP from both switch.

What the best way to fix this problem?
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R RAsked:
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JustInCaseCommented:
According to Cisco:

How to Configure DHCP High Availability

There are no configuration tasks. The DHCP high availability features are enabled by default when the redundancy mode of operation is set to SSO.

SSO—Stateful Switchover. SSO refers to the implementation of Cisco IOS software that allows applications and features to maintain a defined state between an active and standby RP. When a switching occurs, forwarding and sessions are maintained. SSO makes an RP failure undetectable to the network.

http://www.cisco.com/c/en/us/td/docs/ios/12_2sb/feature/guide/sbdhcpha.html#wp1049428
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R RAuthor Commented:
Thanks, its already enabled but still switches stop distributing IP.......is there some approach to look at it as we have done a lots checks but no clarity why it stops sometimes for all Vlans and sometime only for Voice vlans.

Is there some limitation on Cisco DHCP on network size like...only 100-200 hosts or few vlans ...etc
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