Fail to delete IPv4 ARP entry

Log reports every 3 seconds an emergency error: 
Tue Jun  3 22:26:18 2014(GMT+0100) [rv180w][Kernel][KERNEL] [ 1724.530000] <sppe_cmd_arp> Fail to delete IPv4 ARP entry
Furthermore, static DHCP ip addresses get routed wrong after 3-4 days running time.
Any ideas?

Hello plier0001,
debug arp all  and check the output.
Have you rebooted?

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