Follow-up
While it is not 100% it's working again. I believe there was no single issue but instead different things that all contributed. Basically, I replaced the foot valve, the wiring on the pressure switch was not solidly connected causing the pump to turn off and on somewhat randomly, and it seems the cut in and cut out on the pressure switch were out of adjustment. Because the switch is old and and a little rusty, it is difficult to adjust. I don't have an extra switch on the island and will get two so I'll have a spare after replacing this one.
The low water level in the lake coupled with warm, calm water seems to have led to higher algae than usual for this time of year. I'm also thinking that might have "gummed" things up a bit and now that everything is cleaned off runs smoother.
A related question: Do people leave water lines in the lake over the winter? With the warm water and low lake level I am thinking of putting my line out another 20 feet of so to help minimize picking up "crud" due to wave action. It would be a hassle to get it out that deep in the spring but easy to do now. I wonder what would happen if I just leave the one end in the water over the winter.
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