FOR THOSE OF YOU THAT STILL HAVE PROBLEMS:
Try these solutions ONE AT A TIME and plz report back if any of them helped you.
For me it was 1, 2, 3 that worked.
1. Uninstall OBS Studio and Streamlabs and any similar streaming software. (Yes even if you don't use it)
2. Run Borderless windows
3. Use Nvidia driver 417.35
4. AMD user activate Chill in Catalyst and cap frames at 80
5. Try DISABLING ALL Notifications in Origin, yes all of them + disable Origin in game (Application Settings/Origin In-Game)
AND Right Click Apex Legends in Origin and select Game Properties and deselect "Enable Origin In Game for Apex Legends"
6. If that doesn't work, MAKE A NEW WINDOWS PROFILE and try the game from the new profile, but FIRST disable Origin in game + all notifications (you have to do this for each account in windows) + the other thing mentioned above.
7. Update you soundcard drivers
I've now played 50+ games with no crashes.
(I have both cpu+gpu overclocked, I'm running Discord with H/W acceleration, watching Twitch at the same time etc. no crashes.)
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Ofc. I don't think this will work for everyone, but it has at least helped 6-7 ppl already here on the forums since yesterday.
Since it was OBS Studio that had to be removed for me, it might be a codec/sound card related problem.
Maybe try playing with soundcard disabled and/or upgrade your drivers to your soundcard just to troubleshoot.
Anyway Good luck!