Client cache size reverts to default

(SCCM 2012 SP1 with CU5)
I've used a powershell script to set the client cache size to 20GB, using get-wmiobject and the Put() function. I've deployed this to a test collection of PCs using a CI with remediation, and it's both checking and remediating correctly.
However, while the 'compliance' is reported at near 100%, when manually checking the clients, many have reset to 5120MB. This affects both Windows 7 and 8.x based clients.
To take one client specifically, at the time of writing this the CI reports it ran and remediated at 11:45am - it is now 8pm, and the cache is back to 5120.
Triggering the CI to evaluate again sets the cache to 20GB (verified via get-wmiobject), but I'm sure if I check again at some point tomorrow it will have reverted to 5120 again.
I can't see any evidence in any client log that indicates what could be causing this. I've looked into how I can see what has made the change in WMI via the Analytic/Debug logs in Event Viewer, but the tracing available needs to be run at the
time the change is made - and I don't know exactly when that is.
Any ideas?!
Thanks, Bob
Edit: CI is set to evaluate every day at 9am. Client push properties on primary site now include SMSCACHESIZE=20480, but this is recent change - when the existing clients were installed this was not present so they installed at 5120MB.

Changing the value directly in WMI is unsupported. You need to use the UIResource.UIResourceMgr COM object to perform this task on the client side:
http://msdn.microsoft.com/en-us/library/cc145211.aspx
PowerShell examples are available at
http://www.david-obrien.net/2013/02/07/how-to-configure-the-configmgr-client/
Jason | http://blog.configmgrftw.com | @jasonsandys

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note:
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quote:
Set the size of the shared memory buffer pool, that is, the size of the cache.
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