I suggest reading Justins sticky on problem feeders. The vast majority of these posts are new owners that don't realize simple things that they should change in their husbandry or even just their approach in offering the prey. It's not terrible, everyone had to learn at some point. I think back to my first bp "problem" eater and that even though I had her enclosure pretty good I was probably simply over handling her.
This, X1,000. What finally did it for me was blow drying the mouse to warm it up a bit. Now I just thaw it, put it in his tub and that's it.