am also having this issue and have tried everything, it also happened on fortnite and someone has said its got to be a programme that's interfering with the game launching but i can't find anything that would cause this plus i have never had this issue before with apex it just suddenly started happening. the only quick fix for me is to restart pc and it will work.
My antivirus was interfering with some Origin games historically. Sophos Antivirus can be aggressive at times against some anti-cheat software.
It was still blocking it, even with the antivirus disabled through the software, so I had to contact their support to discover another Exclusions section in the advanced settings.
Considering your issue goes away after a restart, I'd look at what software you have running on boot-up, and comparing it to what's running when Fortnite/Apex don't work.
Also, posting your system specifications, such as the following, may help people to diagnose your issue quicker:
Operating System
Graphics Card
CPU
Motherboard
Specific driver versions, especially for video drivers
Antivirus software
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