Roblox memory problem and Crashes

EDIT> error log here even though it doesnt say anything important

I was testing a game of mine in test server with 1 player, and suddenly my screens started flashing black, and I got this error box.
Although as you can see in the picture, my memory usage is not even near the maximum. This has never happened before.
I have no idea what caused it and [strike]its not reproducible but… Wow.[/strike]
This happens everytime I try test server with a player now. In the player window

And after running the test again, I get a roblox crash and this. I playtested for hours yesterday without problems and I havent changed anything in the code