My garage door closes in the morning but not in the afternoon.

Why does your garage door close in the morning without a problem but not in the afternoon? Or maybe the opposite is true and your garage door doesn't close in the morning but has no trouble in the afternoon. If you have exhausted the obvious options like 1. making sure nothing is obstructing your sensors field of contact,
2. making sure the sensors are tightly screwed on and do not wiggle, or
3.  using the same accessory to open and close during both times of the day

Then pay attention to how the sunlight beams at your sensors. Sunlight can interfere with the sensor eyes coming into contact with each other. Check with your manufacturer's instruction on how to combat sunlight that's hitting your sensors. Typically they provide a shield of some sort without interfering with the sensor's beam.