Getting shocked only sometimes could mean the faulty hardware is something that only runs sometimes, such as a heater
Something else I wanted to touch on, but after the multimeter stuff ...
You have a ground probe and are getting shocked.
Does this mean you don't have a GFCI ?
Using a probe without one is much more dangerous than not using a probe at all. You are allowing the water to become fully energized (completed circuit) from a voltage leak but doing nothing to protect yourself
If you are using a GFCI, test it
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