And your updating the router via it's web page right under Tools/System?
I would ask your ISP about this and also inquire about the flood ping attacks, this could be an issue on there end too.
Try setting Firewall settings to Endpoint Independent for TCP and UDP under Advanced/Firewall. Later on after you contact your ISP.
The router is doing it's job by detecting and blocking and it's reporting what it finds, however if all that keeps coming at you, it could be a source of interference to the router.