Gmod Crashing randomly sometimes !!Help!!

Hello. I have to ask you guys why my gmod randomly crash sometimes when i playing DarkRP, and i getting missing files on veifired gameCache Why?! Im running on Windows 8 computer and i tried to reinstall the game but it dident work so why?

What game content do you have installed?(e.g css, hl2, hl2 ep2?)
What are your specs?
Can you post us your latest MDMP files?(upload them to a website like mediafire or mega.co.nz)

All my specs should looks fine but I dont have any GPU ATM and i have only CSS Content installed nothing more