Make sure your Motherboard has the latest BIOS and CHIPSET installed and check the Motherboard's MEMORY QVL list to make sure your RAM Module number is listed. The Ryzens CPUs seems to be fairly sensitive to the type of RAM Installed.
Here the Asus Motherboard MEMORY QVL list : http://dlcdnet.asus.com/pub/ASUS/mb/SocketAM4/PRIME_X470-PRO/PRIME-X470-PRO-memory-QVL-for-Ryzen2nd-... .
The latest BIOS and CHIPSET for your Asus Motherboard: PRIME X470-PRO Driver & Tools | Motherboards | ASUS USA
BIOS
Version 40112018/05/028.16 MBytes
PRIME X470-PRO BIOS 4011
Update AGESA 1.0.0.2a + SMU 43.18
Chipset
Version 5.12.0.382018/04/18372.43 MBytes
AMD Chipset driver
AMD AM4 Chipset Driver V5.12.0.38 for Windows Win10 64bit. (AMD package version is V17.40.3765, VGA driver version is V23.20.840.0)