I'm piggybacking on this as I have the same issue. I've noticed mine on the 15th of october. My frames also dropped from a stable 90 to about 5. All my performance statistics are completely fine. No CPU throttling, no memory leak, no high temperatures and the GPU stats even look like they're idle. I have changed nothing on my device, no crazy software changes either other than windows updates and nvidia updates. Rolling them back to previous versions did nothing. I would also like to point out that Apex Legends is the only game that is suffering from this frame drop. Everything else performs properly. This completely blows as I have an XP boost running from my premium pass that I can't use right now. Wasted money.
Can this issue be ranked at a high priority internally? It's not a matter of a single skin not working or an animated banner crashing the game. I'm 100% locked out from participating in any gameplay.