What is your husbandry like?
How big is the cage, describe your hides, temps, humidity?
Are you handling your BP often?
What did you use to feed (prey size, how often, how)
BP can go months even a year without any issues and very little weight loss now if one is losing weight dramatically there could be another issue such as internal parasites.
Going of feed can be seasonal, stress related (which can happen over time even if animal have been kept in the same manner for years), link to diseases etc.