My brackets keep falling off?

I have a had braces sense last July. Throughout having braces, my brackets were constantly falling off. It felt like almost everytime I had a monthly visit to the orthodontist that my brackets were either loose or broken. I watch what I eat very carefully. She just fixed my bracket way in the back and now it's loose again. I was chewing on soft bread and and piece of the bread got stuck between the wire thing in the back and caused my bracket to be loose again. One time I was simply brushing my death and the wire popped out caused the bracket to be loose.. Does anyone know how I can fix this on my own because I'm tired of constantly going back and having to pay for each repair visit that I need to have?