power/laptop intermittenly not shutting down overnight

[Windows 10]

dell told me to look at fast start up which I can't even find and to turn it off as it might be interfering with laptop not shutting down sometimes overnight. I dont' see why that would be the case after four years of owning it. I've inserted my power settings whiich were set by a computer expert and the laptop was turning off eventually over night after going into sleep. I did do a recent update of the Dell Power management. All window updates are on. Ideas?

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