I have several people comment that the beer is nice however flat. I have brewed several types of beer. They all were stored in Kegs beyond the recommended/suggested time.. The BrewFlo temperature set on 3. I like a cold beer. The poured beer has beer head and there are small amounts of bubble in the glass, however within a short period of time, (1/2mins) there are no bubbles and when you drink the beer its almost like flat beer. The taste is like a flat soft drink that was left open for a couple of hours. Any help would be appreciated.