Gaming Notebooks

I am pretty frustrated with HP let me tell you.  I've had this laptop (HP Omen 17t-an100 CTO,  Product #: 2XP12AV) since September of 2018, so of course it's out of warranty.

A few weeks ago, I was typing an email and all of the sudden the computer just instantly shut off -- I was plugged in -- it was the equivalent of watching TV and the power going out.

I hit the power button but the laptop would not come back on.  The power button would illuminate for about 5 seconds, then stop for about 5 seconds and repeat.  After about 15 minutes of this, I would shut the lid.  After a certain amount of time, say 15 minutes, I would open the lid and then eventually the computer would come back on.  WEIRD.

Lately, this is happening more and more often.  There's no rhyme to reason -- its not like it only happens with using certain programs.  Ive run the HP diagnostic on all aspects of the PC and I've done the UEFI diagnostics as well -- both the fast and the extended.  Nothing shows a problem on the diagnostics.  Battery says its okay.  Maybe it isn't a power issue?  I've run HP update and Windows update to ensure all drivers and software is up-to-date.

This is so frustrating.  The computer is out of warranty; I spent a LOT of money on this machine.  Why is this stupid problem happening?  How would I even start to try and fix it?!?!?!?

Any really smart people out there have an idea on what I should do next??

Thanks,

Jeremy