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This ended up being a hardware issue and was resolved with a fix from the manufacturer (an issue with the hdmi ports..). Thanks all anyway.

No luck with those either I'm afraid, I'm suspecting a hardware issue now to be honest. With a bit of luck I can still exchange it.
The help is much appreciated anyway.
Thanks to all.

All the windows sleep options are off, secure boot and fast boot are also already off - these have no effect.
Interestingly, if I select the windows option in Grub and hit 'e' to bring up the edit...

Hi all,
I've just installed ubuntu 22.04 as dual boot on a windows 11 NUC and now selecting windows boot loader from the grub menu sends the box to sleep. I need to press the power button twice...