Check for loose parts or missing screws. If there are none, check for objects blocking the drawer. If none of the first things seem to be causing the problem, look for swelling (bulging). There may even be moisture present. And consider the humidity levels of the room the drawer is in––anywhere near showers, baths, cooking areas, etc. are likely to have higher humidity than other parts of the house. Or, if you’re in a humid climate or season, the entire house may be humid, which will affect your furniture.
