Four failures in the same line strongly suggests the crack is moving, and no filler survives movement. So diagnose before you buy anything.
What to check:
Is it seasonal? Cracks that open in winter and close in summer are usually normal movement - timber drying, the building breathing. Common and not structural.
Does it follow a line in the structure? Along a joist, at a ceiling junction, above a door, at the join between two materials. Those are movement joints in all but name and they will always crack.
Is it getting wider over time? Put pencil marks either side, dated, and measure monthly. Stable width means movement you can accommodate. Steadily widening is a different conversation and worth a professional.
Is it stepped or diagonal from a corner? That is a different category and not a filler question.
Assuming it is ordinary movement, the fix is not a harder filler: it is a flexible one, and reinforcement. A crack that moves wants either a flexible decorator's filler that can stretch a little, or scrim tape and a proper patch that spreads the movement over a wider area instead of concentrating it on one line.
Rigid filler in a moving crack is guaranteed to fail, and it fails exactly the way you describe.