Whenever I play Minecraft for about 15 minutes my screen starts to flicker black. I launch Minecraft from the Twitch application to use FTB mods. It starts to flicker not terribly but progressively gets to a point where I can't see anything. It happens mainly when I move around. It spreads to other parts of my PC but isn't nearly as bad. A temporary fix I've found is turning off my computer, unplugging my monitor, and letting it sit for about 2 hours. It isn't a RAM problem because It started before I started allocating more RAM to Minecraft. It happens on and off of fullscreen. It happens on both modded and non-modded versions of Java Edition.
What I've Tried:
Reinstalling my Drivers.
Updating my Drivers.
Updating both Minecraft and Twitch, and reinstalling Twitch.
I have an Intel Core-i5 6400
8GB of ram and 6GB allocated to my Minecraft worlds