Cisco 1603 in a VPN dropping connection after 1 minute 59 seconds

Hopefully somebody has a simple answer to this one. We have a VPN between 2 offices both with cisco 1603's. 2 weeks ago the guys who connect to us lose their connection every 1 minute 59 seconds after connecting and then exactly 15 seconds later they automatically re-connect. Does anybody have any ideas as to how or why this could occur?
tekenq1Asked:
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gpriceeeConnect With a Mentor Commented:
It seems to me that either your input queue or output queue is full and causing the packet drops.  "Input queue drops are counted by the system if the number of packet buffers allocated to the interface is exhausted or reaches its maximum threshold. The maximum queue value can be increased by using the hold-queue <value> command for each interface (the queue length value can be 0 - 4096. The default value is 75)."

Enter the following command:
show interfaces ethernet 0/0

If you're seeing a history of drops, don't rush to judgment.

Enter the following command:
show processes CPU | i ^PID|Input

An excellent Cisco document referring to understanding and troubleshooting queue errors can be found at: http://www.cisco.com/warp/public/63/queue_drops.html

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GenexenCommented:
traceroue, see which hop is flapping.  Or maybe his IP is changing.  Or he has bad hardware.

Its happening because something is broke.  You'll need to do a lot more troubleshooting to find out why.
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gpriceeeCommented:
Any luck here?
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gpriceeeCommented:
I'd like to know whether or not the issue was resolved.
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