I'm not so sure your speedtouch 330 needs port forwarding. I don't know. Portforward.com don't list all models, only those that have been donated by users mainly. So it's not always easy to know whether a particular model needs it or not if it's not listed at Portforward.com.

Which Router device do you use? Is it listed at Portforward.com ?

As far as SP2, no it might not necessarily even be due to that. I was exploring possibilities. If it is the issue, then ... hmmm.. not sure. For some people sp2 is fine.