A rather far out possibility. Brevs only live about 2 years max. If you or the vendor you got them from selected the larger animals they may simply be reaching the end of their life. I don't know how long it takes a brev to go from the wild to your terrarium, but if it was caught as an adult (again, a larger animal is more likely to be selected or even found by a trapper), held, exported, held again, sold to the wholesaler, shipped, etc. it could be months. For an animal that only lives about 24 months this is a huge part of their life gone. As they age they may become more sensitive to all the accumulated stresses, injuries and illnesses gathered over time. Immune system may just be wearing out. I would use a UVB light just in case there was some subtle deficiency lurking. It certainly won't hurt them, might make their enclosure a bit more like a wild habitat, a bit more stimulating and might even keep bacteria from developing as quickly. There is obviously a lot we don't know about these little ones. So many die this way and we never get a clue. They are so tiny that diagnosing or treating even mild health problems is very difficult.

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