When playing minecraft for a while no matter if it's modded or vanilla, my minecraft client's icon would start flashing in the bottom like this https://youtu.be/YE6ACEvd2fg or the one below. When it does(it's kinda random, works fine for 10min, and then ti doesn't work for 30min. When it starts, it repeats every second or so.), I lose my fullscreen if I'm in fullscreen and focus(mouse hold) in any mode, which is annoying if I appear to be mining obsidian. I don't think the problem is causing any external program, because in video above I'm running windows in SAFE MODE. Can you please tell me, why is that happening, is it or it isn't a bug and if it's my fault, minecraft's or java's.
Thank you