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This article may help: https://www.gardeningknowhow.com/plant-problems/environmental/what-causes-brown-edges-on-leaves-of-plant.htm

If the roots are tightly packed in the container, it is time to repot the plant. This article will help:
https://www.gardeningknowhow.com/houseplants/hpgen/learn-more-about-repotting-houseplants.htm

It is likely a fungus. There are several that can create those yellow spots. Treat the plant with a fungicide. I like neem oil myself as it treats both fungus and pests and is safe for people and pests. This article has more information on it: https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm

Here is an article that you may find helpful: https://www.gardeningknowhow.com/houseplants/rubber-tree/propagation-rubber-tree-plant.htm

Here is an article that you may find helpful: https://www.gardeningknowhow.com/houseplants/rubber-tree/prune-rubber-tree.htm

They are dormant in the winter time (even though they are kept indoors). Their growth will slow and they will need a little less water. You can repot the plant when the roots become crowded. When they are crowded, they will look like a solid mat when you take the plant out of its pot. When repotting, move up only one pot size or at least 2" larger than the current pot.