You have disabled every preset and still encounter this issue? Have you ensured there were no queued tasks?
The next step is to to to Admin → Config → New config with these params:
Key: cwmp.debug
Value: DeviceID.ID = “<acs_id_of_your_device>”
Then you need to initiate communication with the CPE and then review the genieacs-debug.yaml file in your log directory. The exact location is specified in the GENIEACS_DEBUG_FILE param in your genieacs.env file.
What you are looking for is where a value is getting flipped back and forth.