Home builders usually install low-quality bumpers on cabinet doors in kitchens and bathrooms. Bumpers keep the doors from loudly banging into the cabinets when closed. Cheap bumpers tend to get hard over time and lose what little ability they had to cushion door closure, so you experience banging and rattling. They also tend to get sticky so that sometimes you have to pull hard on a door to open it.
Fortunately there is an easy and inexpensive remedy to hard, sticky cabinet bumpers. Replace the cheap bumpers with the best bumpers made. Replacement bumpers found at hardware and home improvement stores aren’t much better than cheap ones, but may be your preference. I am promoting Quietex bumpers because they are far superior to anything else out there for durability and performance. Either way, bumper replacement is shown below.
Note that each door will have at least two bumpers (upper and lower). Kitchen and bath drawers also usually have bumpers which can (should!) be replaced as well.
Quietex self-adhesive bumpers come in sheets of 50 each and shipping is usually free. They can be purchased online from a couple of sources:
These bumpers have a few other uses as well (to keep pictures hanging straight, non-skid feet and more).