Open a Online AMD RMA REQUEST Ticket for your Ryzen CPU and see what they say. Here is where you can fill out the RMA Online : https://support.amd.com/en-us/warranty/rma
This the latest Asus BIOS for your Motherboard. Is the one you updated with: ROG STRIX B350-F GAMING Driver & Tools | Motherboards | ASUS USA
BIOS
Version 40242018/09/217.82 MBytes
ROG STRIX B350-F GAMING BIOS 4024
1. Improve system performance
Do you have all the Motherboard Power PSU cables connected including the extra CPU Power connectors?
What type of BEEPS do you hear when it is booting up during POST?
Is your RAM MEMORY listed in Asus Motherboard QVL list for the Ryzen 2xxx series CPU? https://dlcdnets.asus.com/pub/ASUS/mb/SocketAM4/STRIX_B350-F_GAMING/ROG-STRIX-B350-F-GAMING_Memory_Q...
Is your CPU Cooler installed correctly and it is tight against the CPU surface?