This^. The door should be balanced - if you position the bottom about 4 feet off the ground it shouldn't go up or down. After 5 years the springs are probably relaxing a little so may need a little tightening to get the balance. And it should move smoothly without binding. A little lube may be all that is needed if it is stiff/binding.I would start by disconnecting the opener and see how the door opens manually. if it's stiff or tight. maybe the opener is getting slower.
but yes, there should also be occasional door maintenance too.
