bandbun

Are you eating 1/2 cup to 1 cup of food total per meal and stopping when it's gone even if you're still hungry? Are you making good food choices and getting in all of your protein? Do you count calories?
Have you had fills? Do you have restriction? All these things will greatly effect weight loss.
I suspect there is nothing wrong with your band but rather you may have to make some changes to your eating habits.

Plateaus are a normal part of the weight loss journey. You may find that mixing up your diet and/or exercise routine will get your scales moving again.
In the meantime, take a moment to notice whether your clothes are feeling looser, or maybe your knees ache less than before, or perhaps you are climbing that flight of stairs without getting puffed. These are NSVs (non-scale victories) and they are just as important as seeing the numbers move on the scales.