Windows build SOMETIMES results in the game stalling on a black screen while trying to open the main menu upon launching the build

So what is happening is that when we make a Shipping, Pak file included build, when opening the build the .exe will stall on a black screen unable to progress on to the menu screen. It appears as if it is unable open all the files.

When we make a Shipping No Pak file build it crashes.

When we make a Debug No Pak file build it never crashes or stalls but SOMETIMES doesn’t have any audio (closing and reopening seems to solve this)

Anyone else experience this problem? Any suggested leads on what to look at?