Your doctor is the only one who can help diagnose whether you're having a problem with your band, and what to do about it. Good luck on that score.
I wanted to let you know about your weight loss right now. You are NOT on a plateau. When you're in the first few weeks post-op, and on a mostly liquid diet, your system is flushing Water weight. The large weight loss you've experienced is totally normal. But when you start eating "real" food again, your metabolism slows down, and processes that food in a different way than it does a liquid diet. When you're back fully on solids, your weight loss will be even slower - for a few weeks. But if you stick to your daily diet regimen and exercise plan, and let each day look like the day before, after a time your body will reset the metabolism set point, and your weight loss will continue. it isn't a plateau, it's your body adjusting to the changes in diet you're giving it.
A big thing you'll want to know and fully understand as you move forward on this journey: Weight loss is rarely linear or constant. Instead of picturing your weight loss as the side of a loading ramp, that slants downward steadily and smoothly, picture the side view of a staircase instead. You'll go along on the horizontal step for a bit, then suddenly drop down to the next lower step. You go along on that step for a bit, then drop down to the next lower step. The length of time on one step will vary, as will the height of the drop to the next lower step.
I have my diet and exercise plan set to lose two pounds a week, but that doesn't mean I lose a pound every three and a half days. It means on average, I'm losing two pounds a week. I've been losing about ten pounds a month, but I may go a couple of weeks without losing anything on the scale, then suddenly drop a pound a day for three or four days. It's not consistent, other than to continue moving downward.
So as you move forward in your journey, don't get frustrated if you go a week or two without losing anything on the scale. Keep focused and doing what you know you should, and the weight will drop off when it's ready. The biggest issue I've seen is people getting freaked out and start changing up their routine, without giving their bodies a chance to catch up to the steady changes we're pushing on it.
Good luck with your journey, and hope your doctor will tell you everything is okay with your band!
Dave