I personally wouldn't know the answer to the first question but I'll do my best for the other one.

It may be husbandry issues.You should find out your exact temps and get them to 90-95 on the hot side and 80-85 on the cool side. Digital thermometers are best for finding the exact temps, most people on this site use accurite, which you can get at wal-mart for around $10. The other possibility is that it could be a seasonal fast that some BPs do although it usually takes place more early-mid winter. It may have been triggered by lower temps in the enclosures.

Hope this helps