SuperBB speeds have slowed down to same as old BB speeds

Hi,

When I first recieved SuperFibre BB a few months ago I achieved speeds up to 80MBps. Since then and for the last few weeks it peaks around 2MB, which was the same as my old standard BB. In fact the upload speeds are faster.

The router suggests I should see speed of 70MBps.

So, whats going on? I begrudge paying the extra when I suddenly dont get what I pay the extra for.