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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.

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