I might have found how to fix the bug where when you try to start the map with mods it crash or never simple freeze your Gmod... here what you need to do (it's simple).

1- Disable all your mods (Unless the Gm_Born map).
2- Enter in the Gm_Born map then leave the map.
3- Activate all your mods again
4- New you join on the map again.

It's that, hope it work for you like it worked for me! Good luck.