We have had our breville youbrew for about six months and although it has been moody at times we were still always pleased with the results. For the last two weeks it has gone through all the steps, but there was at first alot less and now no brewed coffee. It grinds, brews, steeps and there is simply no ccoffee dripping out. After the time it just says empty coffee filter. Today ist has said de scale for the first time? What could be wrong?