Dennis,
You will need to call into the support center and open a case @ 1-866-606-1866. The engineer will need to test this in our lab to see if we are able replicate the same action.
What firmware was you currently running on RV220W, if not the latest you need to factory reset and upgrade? This would ensure that it wasn't an old bug.
Latest firmware 1.0.2.4
Release notes - say
• Fixed an issue with IPv6 6-to-4 tunneling and default dynamic routing.
http://www.cisco.com/en/US/docs/routers/csbr/rv220w/release/notes/RV220W_Release_Notes_1.0.2.4.pdf
If you were on 1.0.2.4 and this happened when enabling this feature then it possibly is something with the code so please give us a call.
Thanks,
Jasbryan