Thanks for the reply, up till yesterday, the water was always lower. But on Sunday, I replaced the flapper seat, and on Monday it was running again. But after flushing it Monday morning, it has not started to run again. I’m wondering if it takes time for the rubber flapper to settle into place on the flapper seat (time to mold it self to the seat because of the water pressure). So, so far, it seems to be working.