Have you tried leaving the crate out for a time? I have no issues with any of mine with the crate. I leave the crate/carrier out with a blankie in it for them as a cat bed so they think nothing of the carrier meaning anything when they see it. I had a cat years ago that had major issues with the carrier and would be the devil to get in the carrier. When she went to the bridge I decided I didn't want that to happen with the next cat I got so asked my vet what to do. He told me if I had the space to leave it out all the time then leave it out. If I didn't then take it out 2 or 3 days before a vet visit so they would get used to seeing it and not think much of it by the time came to be crated.