We just got our J-365 in August....we absolutely love ours too! So when I read your question, I pulled out my manual. It states that the suction covers should be cleaned every 2 months, or when weak pump #2 performance is observed. Then it says to ensure optiumum performance, clean and reuse both main filter cartridges once a month. Have you done this yet? More experienced Jacuzzi owners may chime in, but I guess this is where I'd start. Good luck, and let us know if this works!
--renee