This could be an unreasonable cause, but here’s some troubleshooting to try out just in case if you haven’t already 
- try running FiveM in Windows 8 compatibility mode: 1) Right-click the specific application and click Properties. 2) Go to Compatibility tab, then check the box next to Run this program in Compatibility Mode for: 3) Select the version of Windows to use for your application in the drop-down box
- under the “GTA V Black Screen, Flickering, Crash on Startup, & Frame Drops” and “GTAVLauncher.exe Stopped Responding” https://www.gamersnexus.net/gg/1906-gta-v-crash-fixes-for-pc-black-screen-lag
- integrated vs dedicated GPU [Solution] Forcing FiveM/RedM to use your discrete GPU | Infinite Loading Fix
- Check if FiveM is allowed through your firewall through public and private connections (Control panel>System and Security>Windows (Defender) Firewall>Allow an app or feature… )