Game softcrashes when almost connected

[Joulle]

in this case I can't tell you just to check your console if there's any errors causing you to have these issues, but you can always check the crash logs and do a bug report on gmod itself: https://wiki.garrysmod.com/page/Crash_Reporting

Of course you could always try disabling every and emptying your gmod cache and get rid of other downloaded files and try to join the server with a fresh install.