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In my garden I have some paving slabs, laid a few years ago, which have become increasingly uneven since then. The paving itself seems fine apart from some wearing around the edges. Does anyone know why this happens or how it could be fixed easily? Or even, if anyone knows how I can prevent this happening again in future? I have been told that adding ‘sharp sand’ beneath the slabs to fill beneath can help even it – or would it be best to re-lay the slabs with some new sand underneath?