Is there way to detect Page file size change source within Windows 7?

Question

In the office, I do my work on a Windows 7 machine that has 16GB on RAM. However, after each restart it automatically sets the pagefile to 3072MB. I have created a delayed schedule task (which calls a Powershell script) to increase it to a more appropriate value, but sometimes it fails.

Even if the startup script works, the pagefile size gets reset from time to time (maybe some administrative scripts are run).

So, I thought of digging through startup scripts using Autoruns. I have found some Powershell scripts, but cannot find anything related to pagefile being set.

I have also taken a look upon Event Viewer, but could not find any event related to page file size being changed.

I have also talked to the local IT, but they do not seem to know what is causing this.

Question: Is there way to detect Page file size change source within Windows 7?

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Powershell script I use to change pagefile size:

$computersys = Get-WmiObject Win32_ComputerSystem -EnableAllPrivileges;
$computersys.AutomaticManagedPagefile = $False;
$computersys.Put();
$pagefile = Get-WmiObject -Query "Select * From Win32_PageFileSetting Where Name like '%pagefile.sys'";
$pagefile.InitialSize = 12288;
$pagefile.MaximumSize = 12288;
$pagefile.Put();