With Indie it might have been old age. He is almost 2 years. But Pearl was a surprise. I got her in January this year. She didn't' look diseased at all, she was just dead :(
I all honesty, I thought it would be my other girl Athena who would die first. She was sick for a couple weeks with Ick and some other weird fungal stuff. But she's better now... I just didn't see these guys dying!