Do you mean after a while, not enough water is coming into the pan? Have you taken the lid of the cistern and everything inside is working?
No, plenty of water making it into the pan. It appears that there is some sort of periodically appearing restriction or blockage downstream.
@Stonehedge started
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Do you mean after a while, not enough water is coming into the pan? Have you taken the lid of the cistern and everything inside is working?