I just bought a 4-cup coffee maker to replace my broken Krups. The directions mentioned that, before making the first cup of coffee, I should run water through the system first. I did this, but even after a month of using the coffee maker every day, the coffee tastes like plastic. I've been using the same filters, water, and coffee as I did in my old machine, so it has to be the new coffee maker. How do I get the plastic taste out of my coffee?