password changed but not by me

[geep]

I am setting up a home VOIP network, and three times now the Yealink W52 base has changed the admin password on its own. I have to completely remove it from the PBX environment, reset it, and enter all my settings again. As nearly as I can tell there are no password entries in the template file, and I created a user alias the last time, which has also been wiped out. Extremely frustrating and time consuming, anyone have any idea what might be wrong. I do NOT have an outside provisioning source set up, provisioning is done via the FreePBX software TFTP server.

Thank you

Gordon Howell