If it's suddenly changed it could be a number of things, could be that you need a new pen/cartridge, sometimes the insulin does go a bit funny, it could be that since you're newly diagnosed you may be in your honeymoon stage which as far as I heard can be a bit random at times, maybe you're coming down with a cold/infection/illness that you don't know about yet - that raises blood sugars.
Though one thing I will say is that when I was using Novorapid, expecting it to do anything fast in the morning for me was just a pipe dream, it always took well more than 2-3 hours for my morning Novorapid to bring me down to something sensible.
The simplest thing you can try at the mo is probably just to replace the pen/cartridge and see if that fixes the problem if it does then it was just a dodgy pen/cartridge.