Marking Weekly Upgrade Interval - breaks phone

[ShaneTotalCare]

We recently upgraded our T21P E2 firmware to 52.84.0.125
Under autoprovisioning, if we mark:
Weekly: On
Weekly Upgrade Interval (0~12week): 1
* Confirm *

The phone seems unable to parse the configuration file anymore, and it fails to work.
For instance, if I try to Export the configuration it returns a blank file. Other features (such as registration) stop working (presumably because the config is no longer parseable.). I have to factory reset the phone to make any setting changes.

It works properly under firmware 52.84.0.10

Thanks for your help