Every mechanical system has wear and tear over time. There are few simple steps you can take every few months to perform a maintenance by yourself.
Lubricate the following parts with a silicon spray (do not use WD40). Metal rollers, bearings, stems, hinges and the top of the chain rail (spraying the chain itself is not recommended).
Wipe any debris off your tracks and make sure nothing gets between the tracks and the rollers.
Make sure the tracks are aligned. If not, loosen the bolts, align the tracks and tighten the bolts back.
Make sure your garage door sensor bolts are tighten, the sensors are aligned (facing each other), and clean.
There are few simple tests you can run in order to make sure everything works properly.
Close your garage door, Pull the safety handle to disconnect the automatic opener, lift your door about 3-4 feet high, make sure it rolls smoothly and stays open without rolling back down.
Open your door up, place a 2×4 wood piece under the door and close your garage door. The automatic reversal system should bounce the door back when making a contact with any object.