Hi Brad & Jason,
This is an indication the the SPA525G is performing the equivalent of a warm-boot.
Something on the phone's configuration is making the phone restart some processes.
How are the phones being configured/provisioned? Did you do configure manually, or do you use configuration files?
Is a parameter such as the phone's IP address being changed by the DHCP server?
Does the phone's refresh period match the phone's resync period? If so, then you're configuring a parameter, perhaps needlessly, that is resulting in this behavior.
Strip down your config file so that you only have a simple file with a few lines that only change parameters that must be changed from a factory-default state. There is no need to configure any other parameters. Verify that the phone is now stable. Add parameters back, one at a time until the phone resumes the refresh behavior. The last parameter in your environment is changing each time the phone resyncs and results in the refresh behavior.
Here's a short best practice description for putting together a config file: https://supportforums.cisco.com/docs/DOC-13031
This post has a sample of a simple config file: https://supportforums.cisco.com/message/3322738#3322738
Regards,
Patrick
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One reference document to locate SPA phone resources
