Sometimes garage doors will break down, which will then require the door to be replaced in whole, but sometimes the problem can be fixed by the homeowner. The owner can check their own door to make sure it is working properly. There are a few points that should be checked first –
A. Check if the door is well on its tracks
B. There are no dents in the tracks
C. The brackets that mount the track to the wall or ceiling are not loose
D. The rollers are in good shape and not broken
E. The springs are not broken
F. The cables which lift the door are in good shape, and not cracked
G. The hinges are in good shape, and no cracks
If your doors have any of the problems listed above, they should be fixed as soon as possible. If the homeowner has enough mechanical skills and tools that would be essential in fixing these problems, they would be able to try fixing it by themselves with big caution, since the doors are always under huge spring tension, which makes it very dangerous. If there are second guesses on what you are doing, or are not sure of what to do, it would be best to call a professional, who will fix these problems and ensure that the door is working as safely and properly as possible.
It is also important to be attentive that some problems with garage doors can add excess stress on the panels, which would contain the end results of warping. This mostly happens in old and wooden doors, since they have special maintenance needs which need to be followed in order to keep their best shape. All this could be preceded with just replacing or tightening the hinges, which hold the panels in place. Although in some cases, mostly with wooden garage doors, this is not enough.
If the doors begin to show signs of rotting, or are already rotting, or even have just a slight crack in one of the panels, it would be best to replace damaged door sections, or in the worst case scenario, have the whole door replaced for the homeowners' safety, and also for the best possible performance of the door.
Even if the doors are working properly, the owner would still have to do maintenance a few times each year. This could be done by cleaning the tracks to remove dust and grease, lubricating all parts which touch metal-to-metal (hinges, springs, drums, cables, rollers, side ball bearings and tracks) which will allow the doors to move smoothly. Tightening loose screws would be a good way to save your garage door for even longer.