Garrys Mod crashing after about 10 minutes on DarkRP Server

So. Lately I have been having problems with servers. Mostly DarkRP servers. Whenever I go onto UrbanGamers DarkRP server or any server, i become a hobo, i go to this one spot, and build a hobo hotel using 2 3x8 tiles, 3 3x3 tiles, 1 7x8 tile, 2 5x5 tiles, large blast door and a textscreen. After a little bit i get this major Lag spike and my Garrys Mod crashes with no error message. ( i am getting mad because of all the work i go through to just have it deleted) I have the crash report here. hope this works."]

hope you can help me.