Heat, humidity, stress level, area of the house and everything else is the same except the house we live in.
Even if it is the case it can overtime affect your BP also to help us narrow it down we will need to have more details.
We have tried to feed him his normal sized rats at first (dead and alive) gerbals, mice (different colors alive and dead) a hamster and even a day old chick.
BP are imprint feeder and you need to stick to it's regular diet
Feeding gerbils (very aggressive with long teeth), hamsters (too furry could cause blockage) or chick (will cause runny smelly stool) is not a solution.
My other bp was even placed in petey's tank for a while to see if it would jar him a little because of the smell and interaction... nothin.
This should be avoided as it will only increase the stress leading to even more refusal.
BP can refuse for various reason most commonly husbandry and overfeeding
The last meal he had was a rather large rat
If you have fed him large rat on a weekly basis this could be one of your problem right there.
Because a BP is capable of eating a large prey does not mean he needs to and if overfed he will fast to catch up.

To have a BP feeding with consistency you want to offer nothing larger than a small rat (4 weeks old 45/65 grams) or 2 to 3 mice a week.

Here are the question so try to be very precise

How old and how big is your BP (weight)?
What type of enclosure do you provide?
How big is your enclosure?
What kind off hides do you provide, do you have 2, are they tight (all side touching is body) and identical?
Do you provide belly heat?
What are your temps (cool and warm side)?
What is your humidity?
What type of thermometer/hygrometer do you use (dial,stick or digital?)
How often do you handle your BP?
Is your enclosure in a low traffic area?