Default Internet Connection/Bad Dns

I have a BB 8810, which I purcheased on EBay, works perfectly on Meteor(Irish Carrier) except for a wierd intenet problem...

I am using Opera Mini and sometimes when I connect I get a messege..

Failed to connect to the Internet
900
java.io.IOExeption: Bad DNS Address

I have found a work around which requires me to turn on and then off the firewall. And this works every time, but the problem is I keep having to do it, it's very frustating.

I have tried, reloading and upgrading the OS, niether worked.

Any Suggestions.

Just a bump to see if anyone has suggestions