2851 Router VPN - stack for level DMA/Timer Interrupt running low 36/9000

I have a site to site VPN. On my hub router I am seeing the following message EVERY minute in the log!
%sys-6-stacklow: stack for level DMA/Timer Interrupt running low, 36/9000
I have been trying to figure out what the DMA/Timer Interrupt is and what is causing it to run low.
If I run the "show stacks" command I can see:
<output omitted>
Interrupt level stacks:
Level     Called     Unused/Size     Name
2      1578216246     36/9000     DMA/Timer Interrupt
I am also occasionaly seeing the following
%crypto--4-pkt_replay_error:decrypt: replay check failed connection id=7 sequence number=16171319
I don't know if they are related or not, but I need to find out what is causing the DMA/timer interrupt messages.
Thanks.

It just rebooted
This router it just stands in front of a few servers and applies NAT.
So far this had happened a few times but since morning it rebooted already 3 times.
The Sagem ADSL router at my house has longer uptime. wtf!?!?
cisco>show stacks
Minimum process stacks:
Free/Size   Name
5396/6000   Inspect Init Msg
5368/6000   SPAN Subsystem
58920/60000  EEM Auto Registration Proc
4772/6000   Auto Upgrade Startup Process
5164/6000   DIB error message
5396/6000   SASL MAIN
4968/6000   LICENSE AGENT DEFAULT
5368/12000  Init
4216/6000   Update prst
4384/6000   VPN_HW_MIB_CREATION
5188/6000   RADIUS INITCONFIG
2124/3000   Rom Random Update Process
5316/6000   URPF stats
Interrupt level stacks:
Level    Called Unused/Size  Name
  1      319293   6284/9000  Network interfaces
  2      716358   8548/9000  DMA/Timer Interrupt
  3           1   8388/9000  PA Management Int Handler
  4         115   8612/9000  Console Uart
  5           0   9000/9000  External Interrupt
Interrupt level stacks:
Level    Called Unused/Size  Name
  7       72787   8564/9000  NMI Interrupt Handler
Spurious interrupts: 3
System was restarted by bus error at PC 0x4183BC0C, address 0xC3D1CB7 at 10:51:53 UTC Tue Apr 23 2013
2800 Software (C2800NM-ADVSECURITYK9-M), Version 12.4(24)T, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Compiled Wed 25-Feb-09 17:55 by prod_rel_team
Image text-base: 0x40016C60, data-base: 0x42B47360
Stack trace from system failure:
FP: 0x4759C678, RA: 0x4183BC0C
FP: 0x4759C6D0, RA: 0x41836D18
FP: 0x4759C708, RA: 0x4164D7E0
FP: 0x4759C768, RA: 0x41650314
FP: 0x4759C7E8, RA: 0x41650C68

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              tab on the Cluster node).
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              Sudhir
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              > Linux box 1: 192.168.1.102
              > Linux box 2: 192.168.1.103
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              > Any ideas what I'm doing wrong here? I can post config.xml also if needed.
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