Power alarm does not work

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My Dell Latitude continually drops its power cord when working on the lap. This is annoying in itself, but even ,ore annoying when the PC hibernates.
I have enabled both the low and critical battery warnings in Control Panel, and they consistently remind me to switch to outlet power....... after I restart. Which is a tad pointless.
My 'other' PC warns me when the cord falls out (very rarely) by dimming the screen.
Can some body help with this annoying quirk?
 
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