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?
