Router running tomato message in logs "received packet on vlan1 with own address as source address"

After an indirect lightening hit that traveled down the ethernet cable for my WAP in the attic and hit my ASUS router, I started seeing this message every 5 seconds in the router's event logs. It was also unable to handle more than 20 wireless clients at a time before clients would start losing network connectivity. They'd still be connected to the access point but unable to hit any internal or external servers. Looks like the router was limping along. I swapped it out and everything is back to normal.