I have a fluidmaster device in my toilet. It takes 5 or more minutes to fill after a flush. I have removed the top of the fluidmaster and turned the water on with a cup covering where the water comes out. It has plenty of pressure. I have taken a wire and run it down through the fill valve and am convince there is no blockage there. I have replaced the rubber gasket inside the top. It improved for a short period, but eventually starting taking longer and longer to fill. Sometimes it won't even fill at all. I am out of ideas. Please give me some suggestions how to resolve this. Thanks for any help!
Ronnie

Ronnie