Damn I was really hoping the registry change was going to do it, as I have a 3300V which doesnt support the portmaptime function, so I'm unsure of how to proceed.

Have you logged a support call with Draytek? They *might* have some options...

Quick update...

Setting portmaptime as per the post above has really helped with this issue. I undid all the other changes I had made so just setting portmaptime has cleared this up!

I do still get a few messages but perhaps 5 in the last week as opposed to hundreds! I suspect that the messages that get logged are because the devices are in poor signal areas and keep retrying...

I consider this issue solved!