So as a follow up, I downloaded Intel® Driver & Support Assistant just to make sure all the Intel Drivers where upto date and it did identify that my Intel® Graphics UHD Graphics 620 Driver needed an update.
The update installed Intel® Graphics Driver 31.0.101.2115 for 6th-10th Gen Intel® Core™ Processor Graphics, and related Intel Atom®, Pentium®, and Celeron® processors and also seemed to update some Audio devices.
Glad to say, this does seem to have fixed the initial Dell 7570 laptop going into sleep or hibernate mode, once awoken the laptop and especially Office aps seem to run slowly problem.
In a completely sane world, madness is the only freedom (J.G.Ballard).
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