Flagstone Walkway & Mortar

Hello,

We recently put in a flagstone walkway along my house. It was laid on decomposed granite and the cracks between each stone were filled in with perma sand. The issue we are having is that when it rains, the drip line from our house is causing the perma sand to wash out. Would it be ok to place mortar in between each stone versus the perma sand? Will the walkway shift and need to be re-done? Or should I lift up all the flagstone, pour concrete and set the flagstone on the concrete with mortar?

Thank You,
Corinne

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