After pinging an address it does not show up in the ARP table. NAT/ARP stops working Cisco891f.

NAT stops working then ARP stops working until we remove and re-add the NAT command on Cisco 891f.

Notice below how after pinging an address it does not show up in the ARP table.

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cisco891f#ping 10.193.189.216
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.193.189.216, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/4 ms
cisco891f#ping 10.193.189.217
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.193.189.217, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms
cisco891f#sh arp 10.193.189.217
cisco891f#sh arp 10.193.189.216
cisco891f#

Must remove and re add the following command to make it work....for awhile.

ip nat outside source static 192.168.30.216 10.193.189.216 add-route

Rebooting the router also makes it start working....for awhile.

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The problem always returns between 10 minutes and 10 days later.

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Tried on both IOS but still have problem:

c800-universalk9-mz.SPA.156-3.M5.bin

c800-universalk9-mz.SPA.157-3.M4a.bin