Hey there, it can certainly be that you get bored by the story. So, what you need to do at the moment is stop writing it and reviewing and editing and step away. Put it aside. Think about it.
Perhaps there is something that is missing; a way you could go that will enhance your excitement again. This is usually what I find. If I am bored with it, then there is something missing. I leave it alone for a while and think and mull and then something comes and the whole thing becomes exciting again and off I go.
Stepping away for a bit is a valuable thing to do. You have time to leave it for a week or two.
Hope that helps.
Oh, and you may find that you end up scrapping half of it in the process, but that is OK, too.