Ok so I would say they show signs of incorrect watering practices and low temps, like we suspected. The very bottom looks super dry, like you haven't been saturating all the way. The fourth from the bottom the roots look brownish, they should be nice and white. That usually means they're sitting in moisture too long, probably because they're not using up thier water and you may be watering too frequently, next stop is root rot. I stand by getting your environment in check and watering practices down. I see some dry spots, some very wet, so you need to water the whole pot till there's a little runoff... but they can't use the water if they're too cold. Roots won't grow into very dry soil, they're way slowed down if they're cold.