Freeze seconds after main menu loads

I haven’t played GMod for about a month, and yesterday I decided to play it again. When I start it up, the loading screen is fine, and the main menu loads normally. But less than 10 seconds after it finishes loading, it freezes, and I have to kill the game via Task Manager. I have been playing GMod for 2 years, and have never had this problem before. How do I fix it?

reinstall. do you have a lot of addons? That might cause it to stutter for a bit as it loads all your files.