Sooner or later a healthy, growing houseplant is going to out grow its pot. When a plant gets too large for its pot, the roots circle around inside the pot and start to restrict themselves. If your plants seem to dry out more quickly than they used to, but are otherwise healthy, they are probably pot bound. There are simply too many roots in the pot and not enough soil is left to hold and distribute water.
This is an easy problem to fix. Re-pot your houseplant into a pot an inch or two larger. Don't try to go too large, as too much soil means the roots will be sitting in damp conditions and the roots will begin to rot.
This is a good time to freshen the soil and maybe add some slow release fertilizer.
Sometimes you don't have room for a bigger plant and pot. If that's the case, you can maintain the plant's size by pruning back the top and the roots by about a third, and re-pot with fresh soil, i the same pot. This is stress the plant in the short term, but it should recover. Keep it well watered and out of direct light, until you see it has adjusted.
Here's a quick video showing the steps for How to Re-pot a Plant
