Hi and welcome, Daniel. Since you're in winter, just coming to spring now, the plant has been growing slowly. It's natural for it to lose the bottom-most leaves as it grows new ones out the top. I see you have a nice new one starting. As long as the new leaves look good, I don't think you need to worry.
As the weather gets warmer, you will need to water more often, and start to fertilize. This will help the plant to look more healthy as growth speeds up through summer. Don't worry about losing the lowest leaves.
In warm climates, you really shouldn't expect to be able to grow this plant in a pot for very long. They get huge. Better be scouting out a spot for it to grow outside, in a year or two. The pot you'll need for it by then will need a front-end loader to move.