Is your snake refusing food?
And you've tried all methods in your arsenal?
Do you thaw your prey in warm water ( with or without a plastic bag)?

Try thawing a chicken break or a steak ( in a plastic bag) in warm water... you'll notice that it literally cooks the outside after a certain period of time. This is with warm water.

When thawing prey in warm water you are essentially cooking the exterior. This makes the prey smell completely different.

Try thawing your prey in room temp and then heat it up under a heat lamp or hair dryer for a few mins and then feed.

My snake was refusing all prey...until I tried this method. She feeds on spot everytime - like clockwork. Rats,, Mice... the neighbours dog ( if i ever decided to shut it up)...she'll take it all now!

Worth a try.