In addition to troubleshooting steps metioned previously:
- At the time, reinstalling the Epic Games Launcher didn’t work
I was half way through trying a clean install on a different drive (the integrity of my drives were fine btw, sfc /scannow returned nothing) when the tuesday update happened.
Mine works 100% of the time now (I’m in OCE servers).
I suspect it had something to do with the FortniteStatus twitter account investigation, or the update.