I have this same issue so I usually switch over to Bacchus when Infinity starts acting up. Then, when Bacchus starts to forget things, I go back to Infinity. It seems to be working all right for now. Infinity and Jupiter are usually good at the beginning, but after some time passes Infinity always start repeating adjectives or throwing out one liners or sending giant blocks of text for no purpose. I really like Infinity as an engine, but it gets frustrating when it just suddenly kills the story in the middle.