said by Marcer :

Since the router is set static, it won't make any attempt to renew, the DHCP lease will expire and then you will have problems. Best to have this addressed sooner rather than later, when your client can no longer surf.

said by rickardsred :

Just to follow up....after a couple days with IP address hard coded into the router they lost connectivity, which I assume coincided with the original DHCP lease expiration. I went back and flipped the new router back to DHCP with the cloned MAC address and it worked fine. Picked up the proper reserved IP and all is well.