Cisco APs get disconnected from cisco WLC after 30 min when connected on Juniper SRX

Hi,
I am connecting all my Cisco 1131AG APs via Juniper SRX 240 box and Cisco WLC is placed in the LAN.
We are running LWAPP in layer 3 mode. The APs get dissassociated form the WLC after 30 min.
The Setup is like :-
AP->AccessSwitch-->JuniperSRX(reth2.0)-->JuniperSRX(reth1.0)-->CoreSwitch-->CiscoWLC
could anyone please help me to resolve this issue.

Firmware for WLC is AIR-WLC4400-K9-4-2-99-0
Firmware for AP is 12.4(10b)JA1
The logs form WLC during disconnection :-
Mon Sep 6 20:05:52 2010 AP Disassociated. Base Radio MAC:00:1f:ca:2d:4e:a0
1 Mon Sep 6 20:05:52 2010 AP's Interface:0(802.11b) Operation State Down: Base Radio MAC:00:1f:ca:2d:4e:a0 Cause=Heartbeat Timeout
2 Mon Sep 6 20:05:51 2010 AP Disassociated. Base Radio MAC:00:1f:9e:c1:0d:30
3 Mon Sep 6 20:05:51 2010 AP's Interface:0(802.11b) Operation State Down: Base Radio MAC:00:1f:9e:c1:0d:30 Cause=Heartbeat Timeout

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