[jeffo72]

In case anyone ever encounters this, I appear to have discovered the solution; at least it has not occurred again in the past 2 weeks, despite happening for months before.

Kudos and a debt of gratitude go to member 13456789, for his suggestion that I may have a siphoning issue caused by pushing the flexible waste hose too far down into the drainage pipe. I raised it to ensure the end of the hose was above the bottom of the drum and the problem has not happened since…touch wood.

Thanks member 13456789.

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