I was banded in July 2015 and have had a fill every month since then. The last two times I went in for a fill my band would not allow all of the Fluid and would give the Dr push back. I do not feel any real restriction and I am able to eat far larger portions than I should be able to with the band. Why is my band not allowing all of the fill? Anyone had something similar? I am worried that something is broke ????