Vanda magic red with leaves problems

[galeandra]

Hi, received this vanda magic red a month ago and it arrived with black bugs, I think it was scale, but after using an organic solution with cinnamon they appear to be gone. When the vanda arrived, she lost two leaves that weren't in a good shape, but it was expected after being traveling for five days. Some days ago I noticed three leaves yellowing and they fall pretty fast. But there are black spots in the stem and I don't know if it is a pest or a fungus. Someone said it look like I don't water her enough, but I water the roots about three times a day, I always wait until the roots don't look wet before watering. The humidiy is between 50 to over 80%.

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