I have to eat very low carb to lose. I thought for a long time that low carb didn't work for me, but then by mistake I realized it did. I ate absolutely nothing but meat for four days for reasons unrelated to trying to lose weight and BOOM! weight started falling off. I think you should ditch the bananas for a few days and see if there're any other carbs that you feel you can cut out. I'm not suggesting that you go super low, but maybe see what happens if you do a couple of weeks of no fruit other than berries and no starchy veg.
Another idea is to try religiously measuring/counting/tracking everything. I hate doing that, and can't sustain it for any length of time, but when I do it, it's usually a little kick in the butt and I hadn't realized how much I was really eating.
Right now I'm on a bit of a plateau after having lost almost 65 pounds. But I've been stuck since July. And I can't bear to take my own advice to get moving again. Gosh, I hate counting! lol
Oh, and another thought... is the exercise new to you? Exercise really seems to slow my weight loss down a lot and may have even pretty much stopped it (I have been exercising a lot the last few months). Recently I had an injury and had to slow down a lot for about three weeks and I lost 7 pounds and then totally mysteriously managed to put it back on w/o changing anything. But I kinda think that stopping my exercise was what made me lose for a minute there.
I have t1 diabetes, am working on losing the last few pounds and getting huge benefits from once a day eating!