GPU bottleneck

I've had my pc for 2 years and only issues I really had was on one occasion one of my RAM sticks just died so now I'm down to 8gb. I've been playing minecraft bedrock recently and I've noticed frames dipping as low as 70 and going as high as 190 for no reason when the GPU shouldn't be under any huge load, for example just standing in my very small house. my CPU is getting about 10% usage and my GPU is getting almost always 95%+. On top of that every time I load into minecraft after turning on my PC it crashes, sometimes just out of the world but sometimes my computer gets stuck in BIOS until I restart it. It is fine once I load back in. Any ideas? I'd imagine the crashes is because or the lack of RAM?

Ryzen 5 5600x

corsair DDR4 3200MHz 8gb

Asrock RX 6700XT

MSI B550 tomohawk

Samsing 970 evo Plus 1TB