Not being able to launch a session anymore

Summary

When I try to launch a session it gets stuck on initializing 0% for like 10 minutes. Then it jumps to 33% for another 10 minutes then after that my Fortnite might launch but it will do with a “Network Connection Lost” Popup. My internet is not the issue so I have been trying to figure out what it could be. Ive tried re-installing, trying a blank map, deleting app data and then redownloading nothing seems to work. Any help/ suggestions are very much appreciated as im like 99% done with my map but I cant publish a private version now.

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Other

Steps to Reproduce

Open up any UEFN project
Press Launch Session

Expected Result

Fortnite opening up and joining the current project I just launched a session off.

Observed Result

Initializing 0% taking ages, stuck on 33% for a while. Then sometimes proceeds to launch Fortnite with a network connection lost message. Otherwise will just get stuck on initializing untill I restart UEFN in task manager.

Platform(s)

PC

Additional Notes

My CPU is an i9 13900k, I got told they had issues. I tried updating bios but the issue is still there for me.
My friend has access to the project and he can launch it with no issues. So its 100% my device.
I’ve also tried: Blank map, Reinstalling both Fortnite & UEFN, Making sure they are on the same disk, deleting UEFN’s app data. "
Nothing seems to work for me…

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