[bigbob]

No, not always. But it’s also true that it’s often cheaper to settle junk lawsuits than try to win in court.

[thackney]

It is typically caused by either multiple location groundings of a the neutral in a power system, or by multiple path groundings of neutrals in separately derived systems (from different transformers for example).

No, not always.

Can you give an example where it is caused otherwise? Even a case as complicated as the one referenced in the link below, comes back to neutral connections in multiple locations, although those connections were eventually made through corrosion associated with buried cables.