WillC said:If the white spots are slightly raised and have a soft, cotton-like texture to them, they are mealybugs. If they are flat and lack texture, then it is probably pesticidal residue from the nursery and it can be wiped away with a bit of soap and water on a soft cloth.
If they are mealybugs, let us know so we can tell you how to treat them.
If you are unsure, then carefully wipe away all of the white stuff and monitor the fronds to see if any of it returns. If it does, then you know you have a pest problem.
The yellowed lower frond in unrelated. It is normal for older fronds to die back gradually as new growth is added on top.
If you post a photo that shows the entire Kentia, including its pot, we may identify some other issues. Give your Kentia lots of very bright indirect light and keep the soil moderately moist.
WillC said:Good plan! Kentias are slow growers, tending to put out one or two new fronds and then not producing any more for several months or more. As long as most of the newer fronds remain healthy, you are on the right track.
WillC said:Kentias do best in very bright but indirect sunlight. Very close to a north window or a few feet away from an east or west windows would be best. A plant light will not help that much so save your money. Don't move it outside even for a brief time.
The loss of occasional older fronds is normal as healthy new fronds are added. If you have lost several fronds in the last month or so, then it may be a watering problem. It looks like you may have repotted, but the photo of the pot is not clear enough to tell. Repotting can change watering requirements substantially.
Distilled or filtered water is necessary only if your tap water is hard.
Any chance the cats are using it as a potty?