Sump pump sticks

A while back I posted because my sump pump would only work sporatically. Sometime it would, sometimes it wouldn't-- which could be a problem. After much analysis I discovered that the simple reason was because the parts stuck sometimes. I sprayed them with silicone and it worked fine for a long time.
Suddenly I noticed in the most recent rainstorm that it stuck again. I sprayed silicone. However, it continues to stick. I can get it working by hitting it with a clothes hanger, that seems to get the parts moving. However, I can't always be around to do this.
Any suggestions for getting this thing going again?
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Exactly what sticks? The float? The switch? Is something worn? Grease is probably a better lubricant for this application but not knowing exactly where it is applied, I can't say for sure.
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