Most patches are only bandaids. There is one patch kit that is concrete with latex and it does work fairly well.
What you have is ground movement that is causing this and will always cause this fluctuation. In the summer it will open up and the winter it will close.
To fix it properly, you need a better foundation for your patio.
I would use the latex cement crack stuff. I have the same thing on my driveway and each year I repair it with this stuff and it works. But, it has to be maintained.
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