For the 9c post code... make sure your bios is up to date, try plugging your keyboard & mouse into another set of usb ports, try using a completely different keyboard & mouse if you have them, try reseating the cpu, & inspect the cpu socket for bent pins while you're in there.
 
Random crashing/restarting could be caused by faulty ram. I'd suggest you test all your ram with memtest86. Make sure you test all your ram modules individually with the others completely removed from the system.
 
 

i7 8700K
EVGA Z370 Classified K
G.SKILL Ripjaws 4 Series 16GB (2x8GB) DDR4 SDRAM 2400 (PC4 1920)
Samsung 860 EVO 1TB
Toshiba N300 4GB
EVGA GLC 240
EVGA GeForce 670 (Waiting to get my EVGA 1070 SC2 back from RMA)
EvGA  1000W ATX/EPS
Windows 10 Pro 64
Fractal Design Meshify C

"9 beep post code" ROM BIOS checksum failure. (Replace your Battery) I had to do this on my FTW MB even being new.
Remove all but one Memory Stick
Change to a different Bios
Turn on the Computer and Press and Hold the Red Button to reset the Motherboard back to the Defaults for a count of 5 or 6.
You will need to press the F12 Key to enter into the Bios, if your F12 Key is not working then set your KB Switch to Bios Mode and repeat the above.
Download the latest Bios and update put on a USB Flash Drive (Unzip to the Flash Drive)
Then While you are in the Bios update the current Bios complete and the computer will restart and enter back into the Bios.
After the computer restart enter back in to the Bios and change back to the bad Bios and update the Bios.
Enter back into the Bios and set your setting (Keep the CPU and Memory @ Auto) you want to use save and restart and see how the OS is.
Power Off Change that One Memory Stick out for the next and do this until you have checked all your Memory Sticks.
Once Complete then add all your memory back that is if all of them passed the above.
Enter back into the Bios and then set the Memory to XMP1 Profile save and reboot and see how the OS is.
Not enter back into the Bios and now set your CPU to 40 save and restart and see how the OS is.
 
What is the Part Number of your "G.SKILL Ripjaws 4 Series 16GB (2x8GB) DDR4 SDRAM 2400 (PC4 1920)" Memory?

The Newegg item number for the RAM is N82E16820231826

TSand
I have the 1070 back in the system and have tried the 2nd BIOS (1.05) and the issue remains.... usually giving a 7 beep code.
I'm going to Flash the BIOS again.
 

http://www.pcguide.com/ts/x/sys/beep/amiB7-c.html
 

TSand
Now I'm getting a cmos checksum error flashing the BIoS. I've tried several times and the computer keeps rebooting itself during the flashing process.

That definitely shouldn't be happening. It should only reboot after it has completed the flash.

7 Reset Protocol is not available
Did you reset the Bios back to the Default before updating to the Current Bios?
Power off the Power Supply then after all the lights on the MB go out remove the Battery from the MB
Leave the 1070 installed Only the 1070
Remove all the Memory but one and that would go in Slot 2 (When you add the Second Memory Stick put it in Slot 4)
Wait 5 minutes place the Batter back in the Motherboard and Power on and reenter into the Bios.
Disable CSM F10 Save and restart and enter Back into the Bios.
Save a Profile and Call it Clean Save it Press F10 Save and Restart and boot up to the Desktop.
 
"but doesn't even post before rebooting 3 or 4 more times"
The Bios may be trying to Train your Memory and is why it restarts a few time ALLOW IT TO COMPLETE THIS PROCESSS.
 
Memory
N82E16820231826 = F4-2400C15D-16GRR Not QVL
Not list under EVGA https://www.evga.com/support/motherboard/
Not saying that your Memory will not work only that it is Not Listed as Supported.
 
Memory Type DDR4 
 Capacity 16GB (8GBx2) 
 Multi-Channel Kit Dual Channel Kit 
 Tested Speed 2400MHz 
 Tested Latency 15-15-15-35 
 Tested Voltage 1.20v 
 Registered/Unbuffered Unbuffered 
 Error Checking Non-ECC 
 SPD Speed 2133MHz 
 SPD Voltage 1.20v 
 Features Intel XMP 2.0 (Extreme Memory Profile) Ready

did you solve your problem now ?

Can you try to change your power supply if you have an extra...

Just buy one if it not gonna work then return it.. but I'm pretty sure its gonna work...

Try to change your power supply.. it happen to me before...

TSand
I have the 1070 back from RMA and it still keeps restarting (8 times in the past hour and a half) and giving the 5 beep code.
 
Any ideas?

http://www.pcguide.com/ts/x/sys/beep/amiB5-c.html