Strongbox performance issues

Certain strongboxes, when opened, my FPS drops to ZERO. it's not lag as I have a 6 ping with no packet loss and the memory or vram also doesn't spike. If the box has an explosion or freeze blast, or whatever it is, instant death with 0 FPS. Reinstalled the game and same issue. Only started with the first patch this league. Today's patch didn't help at all.