Pre-existing home, Wisconsin basement, poured walls and floor, 6 years old.

Lots of rain the last week or two and the sump pump has been turning on
about every 3 minutes. Last night we had a power failure and the back-up
Generac didn't start and I assumed I'd have water in the basement, but bone
dry.

Here is what I found: The water pours into the crock when it is below the
inlet pipe, but once filled, never rises above it. I guess from a physics
standpoint that makes sense but, where is that water going if it's not being
pumped out? I have no clue about how the drain tiles etc are laid out.

There is a second sump pump in the same crock as a backup, but once the
inlet pipe is covered, the water never rises to a point where the 2nd pump
would kick in. Primary pump actually pumps into a sewer, secondary onto the
lawn, so it's not just a cycle of same water being pumped over and over,
since the secondary never kicks in.

Second problem which just started, the off switch is sticking on the pump
and it is still pumping, even when the crock is empty, or near empty, so
it's sucking water and air. The float seems unencumbered and it happens
maybe once every 40 cycles, but it is happening. I've reached into the
crock and just jiggled it and then it shuts off. Do I need a new pump?
Switch replaceable?

Existing home we purchased 6 months ago.
More crap to lose sleep over!!