[afnog] Cisco 1605-R Router problem !

[Alamicha Chapuma]

We have a cisco 1605-R router as the gateway to our wireless WAN, connecting
several remote networks to our WAN and the Internet.  The problem we are
having is that traffic to hosts on the default wireless network (using ip
numbers in the 172.16.1.x  range) just stops at times.  The remedy to this
is we have to clear the arp-cache on the 1605 router.  What could be causing
this and how can we get rid of this problem or automate the clearing of the
arp-cache so that there is no manual intervention required.

Please assist !