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Aras_P - I encountered the same problem after 1803. The fix that worked for me is as follows
* Open the Settings app and choose the 'Power & sleep' settings.
* Click the 'Additional power settings' link under Related Settings.
* Against the current plan, click the 'Change plan settings' link.
* Click the 'Restore default settings for this plan' link. The system will restore default values for the plan.
* Now, make changes to the plan as required and click the 'Save changes' button.
* Close all settings windows and restart the computer.
Hope it helps.