Changes in web.config on all web sites

Hello. 
I have a strange problem.
last month we made some changes in the web.config file for some of our web sites do to a problem.
the problem was when user try to open a office file ( word,excel,ppt ) in a read write mode in internet explorer 11 or in office 2013.
and the fix was: specifying custom HTTP response headers like:
<?xml version="1.0" encoding="utf-8"?>
<configuration>
   <system.webServer>
      <httpProtocol>
         <customHeaders>
            <clear />
            <add name="X-UA-Compatible"
value="IE=EmulateIE7" />
         </customHeaders>
      </httpProtocol>
   </system.webServer>
</configuration>
after applying this lines in the web.config the problem was solved.
today a customer complained about the same problem that we fix in the changes we have made.
after check the web.config on those sites we have notice that the changes was
disappear ( like magic ).
I have checked all of our websites in the same farm and i notice that all of the web.config files was modified in the same date and time, its happend on
28/11/2013 :00:00 midnight.
I have tried to view the sharepoint log files from this date, but i do not have them (
Number of days to store log files 14 ).
what could be the reason for this automatic changes in the web.config?

Could their have been updates pending that were just waiting for a restart of the web server? Can you check to see if your server did a reboot at that time?
or
In Central Admin, are there any timer jobs that execute maybe monthly at midnight?
Alex

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