I would first guess for some reason the system is not seeing the Hard Drive when you boot and therefore removing it from the boot options. I am assuming when you say turn your computer on, it is a cold boot and may not be a problem during a restart or wake from sleep.
If there is a bios upgrade, you might try that. You also might disable the full screen logo to see if any messages are showing up that would help solve the problem. There is a possibility the situation involves the hard drive itself and its condition. I have seen threads from some folks running SSDs where they were having this type of problem.
You bios is different from mine in that it the way it annotates the Windows Boot Manager. But you screen shot shows the first boot device as HDD from what I can tell. Is that the Windows Boot Manager option?
Can you disable any of the 9 UEFI boot options?
And I can't see what you have set for the UEFI HDD priorities. So I will assume the boot device is set first.