After 30 months since lap banding, I am noticing more hunger than before. I've been a total success story as I've lost about 90% of my excess body weight. Over the past 4 or five weeks, I've noticed that I cannot stay full for longer and an hour -- that was not the case prior. I have less than 5 ccs of fill -- does the fluid in the band evaporate over time. If so, is it necessary to get additional fill?