I have had snakes shed in quick(every two or three weeks) succession before. Going off food at this time of the year isn't unusual either, especially if the temps were lowered.
It's good that you are monitoring this and it is something to keep track of.
How's the snakes overall attitude. Still moving around? Lots of tongue flicking? Any changes in behavior? Is it soaking a lot in the water dish?
Keep us posted, please.