Thank you all for the advice. I thought increasing the humidity sounded kinda fishy.

I think a new vet is in order here just by his incorrect advice he has given you.
I also double-checked the herp-vet site to make sure I hadn't missed someone, but the one listed in my area is the one I talked to and the only one within a 90-minute drive.

Like I also said, I've never had this problem before and I can't figure out what caused it. My other snake is 12, this one is 10, and I've never had a problem like this. The only thing that has changed is the location of where they're kept in the house, and the location now isn't anywhere near as drafty as the previous location.

I monitor the temps very carefully and I have an accurate digital themometer. I adjust the temp seasonally so it ranges from 95 in the summer to 82 in the winter. Along with that, there's a basking spot that gets about 8 degrees warmer than the overall tank temp.

I clean out the waste as soon as they produce it. I clean the tanks thoroughly once a month. I make sure there aren't any water spills. I'm stumped.