I recently bought 3 877's for a DMVPN job. On upgrading the software to ADVIPServices the router stared clicking. i.e. after the upgrade a clicking noise started to comform within the router, they click every 3secs approx.
With the smae boxes i am having DMVPN issues when they are configured as spokes of the DMVPN i am getting Bad "Refcount in Datagram_Done" errors which seen to be some sort of IOS problem. i have been through a number os IOS's and they same happens with all.
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I had this here in the UK and it was due to the ADSL interface not operating correctly. I changed the "dsl operating-mode" from auto to ansi-dmt, and the ATM interface came up and the clicking stopped.
Don't know if this applies to you in your scenario, but it worked for me.