Game Crash & Blocks disappearing

Since about a week, my game started to have bugs while constructing in creative mode (I'm never playing survival) : I kept placing blocks, the blocks appeared, were solid (I could stand on them), and then, a few seconds after placing them, a complete line disappeared. The bug happened more often as I kept playing.
Now, I can load my game, stand while the map appears, but if I move, the game crashes instantly or after I cross a little distance.

I've been trying for several days to play but I keeps happening, so I can't continue to play Minecraft...