Cold restart memory

Team,

We are having problem in DeltaV (Ver 11.3) controller.
Cold restart memory is set to 30 days. 
But when power is recycled cold re-start memory doesn't hold and needs total controller download.

Following steps are already tried with no luck:
1. Set cold start memory changed to 7 days and controller and PP downloaded.
2. Change back to 30 days and controller and PP downloaded.
3. In Diagnostics Controller cold-restart memory shows status as YES.

Please advise what could be the reason for controller not holding cold-restart memory.

Regards,
Milind

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