Sounds very strange. I cannot say I have ever seen that before. Was this a new system, just configured, or a system that has been in place for a while? Did CME reboot, causing the phones to reboot, and somehow losing the CNF-Files.. I am sure you know, but "show version" will give you the uptime.
I have seen this before a few times, only ever though on a UC-520 and once only on a 540 but never on a UC-560... I don't know why each system exhibits different results/symptoms.
Something goes feral with the CNF files and in particular to SPA phones and older 7960/40 series (Never for the 7965 or 7975 phones), the only way to resolve it was to do what you did and replace the CNF's with new ones by running the "NO" command and reinstating it again.
This also mainly happens when it is a bad shutdown, moreso when it is a SAG or a Brownout and then complete powerdump, it is one of the first things to get effected by this.
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