Ive been running on a 5500 with no problems for a month. Upgraded to a 5900x and started having this EXACT same issue. Only thing that fixed it for me was setting ram to auto xmp which i hate doing, and i tried literally everything dont waste your time. This is infuriating. Rig: Ryzen 5900x, Zotac gaming 3060 12gb vram, 32gb ddr4 (2 16gb sticks), 650w psu, micro atx mobo, brand new coolermaster hyper 212 and case fan. Warzone runs perfect but i get packet loss and network errors on bf6. Again it ran perfect on my 5500, 5900x is unplayable.