@KamiKatze8 Hello ! I don't know if it would help you but I had a similar issue some weeks ago. My game was crashing after 5, 10 or 30 minutes. I don't know what specs you have (gpu,cpu,...) and what settings for your graphism you are using in Gta V but I simply decreased my graphism in the game. (I have a GTX 970 with 2 GB memory, and the game shows you how many memory the games need to play with those settings) It crashed when i had like 1950/2000 MB, when i decreased my graphism to around 1850 MB, it worked fine. Try this and maybe it would help. Just check your GPU memory and adapt the graphism to not exceed it. I hope it's going to help you.
In any case thank you for helping me.