Getting this problem at post screen.

Rightly or wrongly, the UEFI/BIOS thinks that something has changed. If you use the Setup function, you can check to make sure all of your settings are correct and current. Hopefully, the OS keeps booting just the same. Cosmic rays probably flipped a bit in the EEPROM somewhere and it's just letting you know, in it's own unique and troubling way...
HTH,
--Ed--

No, it's not necessarily a harbinger of disaster. You're just trying to clear the alert, and check to make sure nothing unwanted is going on. If everything is OK, it could have just been a transient error. You'll only need to start worrying when the frequency picks up, and/or the symptoms become more acute. Short version: your system is probably OK!
HTH,
--Ed--

CanadianWookey said:

All info in UEFI looks correct but still having this problem. Does this mean I have to buy a new motherboard and CPU?

This can sometimes happen if the 3v battery on the motherboard is dying. While this should not happen in a new system, it does happen.
Try replacing the battery (they're cheap), or test it for 3 volts.

If the battery checks out fine you can do a ClearCMOS procedure. This clears the EEPROM of all current data and refreshes it with a fresh enumeration of the current system.
You can consult your motherboard manual for instructions to perform the procedure, but it is basically:

• Shut down the PC, disconnect the power
• Remove the 3v coin battery
• Locate the jumper on the motherboard for ClearCMOS (or CLRTC)
• Move the jumper from pins 1-2 to pins 2-3, wait a few seconds
• Replace the jumper on pins 1-2
• Replace the 3v battery
• Reconnect the power and start the PC

If the procedure is successful you may need to reset the time in the BIOS/UEFI

Glad to hear it. You should be good to go!