Cisco Wireless LAN Controller Always disconnect

Dear All,
Please help to assist my issue.I used Cisco Wireless LAN Controller model: 5508 with version 7.0.98.0 and I got issue with connection always disconnect ping always loss or some time client can't get DHCP from Controller. 
- I configure as Internal DHCP Server with 1 SSID.
http://www.cisco.com/c/en/us/support/docs/wireless/4400-series-wireless-lan-controllers/110865-dhcp-wlc.html
- DHCP least is not full and I also try to clear-lease all but still not work.

1. Config dhcp proxy enable
2. In case of internal Dhcp, try debug for clients
 using,
debug client <MAC ADDRESS OF CLIENT>

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