I've found that indoor plants can be slow to react to new situations. You go out buy all these lovely plants that have been grown in absolutely ideal conditions and one by one over 3 months start to show their unhappiness by either rotting of shedding leaves. It's a battle to try to get them the most light in my bungalow but I'm persevering! . I've been growing indoor plants now for 2 years and after the first 3-6 months I had a lot of losses some o saved but they can take a long long time to recover and many never do. I think the biggest mistake was buying big plants some never ever get used to your situation.