Welcome to DC! There were two recent threads on banana bread:
Best Banana Bread I've Ever Had!!!
The only banana bread I ever make is the Beaver Club's Banana Bread (Queen Elizabeth Hotel, Montreal, PQ). I line the pans with greased (buttered) brown paper grocery bags and bake in a slow oven for about 2.5 hours. I use pyrex loaf pans. Where is the rack in the oven when you bake it? If it is at the bottom, you might want to move it up one and try again. If that doesn't work, move it to the middle rack position in the oven.