Problem With Remote Viewing

A customer of ours have 4 IP cameras installed of SAMSUNG. I am frequently unable to access the NVR through public IP remotely. The customers public IP is STATIC. When i just power OFF the router for 2-3 minutes and power it ON then its working fine. But after 2-3 days again i am facing the same problem . Is this the router fault or any other problem . Need Suggestions ??

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