Bob & Cathy,
I think I might put on disposable gloves and clean the seal. I have in the past been able to reach into the opening and clean the seal from the top. I might lube it with some hand lotion.
I have had two pumps over the years that did as you describe. It turned out to be the pump wasn't holding pressure. It would leak back to the tank side internally, so you would never see any water anywhere.
Once I understood the problem I just left the switch off when not using water. Eventually I broke down and bought a new pump. In your case it should be covered under warranty. This may be an oportunity to up grade the pump by paying the difference for the better pump.
Hope this helps