have a problem with SharePoint 2010 installation.
We have the farm which contains one WFE and one DB server.
WFE has many customization (one of them is click on My Details in user drop-down menu redirects user to custom page, which holds a lot of custom fields from SiteUserInfoList so the user can view not only their email, job title, department but hobby, age or hire date and so on).
SiteUserInfoList (/_catalogs/users/simple.aspx) has a special fields (custom added) to store details about each user (like hire date or hobby or age).
Authentication model for web application is set to Windows (NTLM) so each domain user can access portal until he is not specially blocked by SharePoint (broken inheritance\special permissions etc).
Today a unknown change of user profiles occur - all custom fields was cleared from data contained in and only fields containing data from user profiles in AD (email, phone, first\last name) left.
The question is - what application or service can initiate this changes and why?
Also why this things can happens every day?
! User Profile Services application is not installed or launched so this changes can not be bound with integrated FIM client.
Also no timer jobs are running which can cause user profiles change.
P.S. Yep i know that this is unsupported and not-a-best-practices so please don't tell about :)