Possible Constant Crash Fixes
FPS Overlays: Disable them (especially if you are you using Origin's built-in one)
In the Origin launcher window go to: (Origin Tab>Application Settings>More>Origin-In Game>During Game Play)
You may also disable the Origin In-Game feature but I'm still using mine at this time (no crashes)
Adding Windows Defender Firewall exceptions:
(Control Panel\System and Security\Windows Defender Firewall\Allowed Apps)
Make sure to add and check both boxes for Origin's Launcher program
While here you can also make sure that Apex Legends has been added and both boxes are checked
I've been running a few games now after multiple crashes throughout the day and final become stable hopefully for good.
I've been playing all night for hours without anymore crashes these fixes must've worked.