For the past two days I have noticed something with my SWG. It seems to be working fine in the late morning. It is generating, I see the bubbles coming from the return and the panel says it is generating. However, when I come home in the afternoon, it still says it is generating on the panel but there are no bubbles coming from the return. And then when I go into the diagnostics both the amps and instant salinity say zero. What does this mean? Thanks for any info.