Has anyone else experienced a strange power issue with their Nuc?

When I go to turn it off, the Nuc shuts down but nothing I do will turn it back on at this point. I need to pull the power and then try and turn it back on but even then it's not guaranteed to start. 

It should have the latest Bios, V27 I think. 

After some weird windows crashes I thought it was ram so removed a stick and it booted ok but still had restart issues so ran windows memory diagnostics on it and nothing came up for either stick of ram. 

Incidentally, the time on windows never gets set right. I have it set to update via the internet but if the box fails and a restart eventually happens the time is way out and I need to do another sync with the internet to get it right. Weird. 

It almost feels like the cmos battery is nearly dead and needs to be replaced but I've had computers last for years before even thinking that might happen. I've never actually had to replace a battery though. 

My monitor won't display the visual bios (it's a weird resolution bug) so I'm going to try and bring it in to work tomorrow and use one of the monitors there and see if I can see anything worth changing. 

Anyway, has anyone else had anything like this happen? Feels like it's either a simple solution or a rma process.