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
Version 40242018/09/217.82 MBytes
ROG STRIX B350-F GAMING BIOS 4024
1. Improve system performance
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_QVL_180125.pdf?_ga=2.…
Is your CPU Cooler installed correctly and it is tight against the CPU surface?