Earth fault with the bass if it doesn't happen with other instruments.
I find it amazing that 'so called' reputable manufacturers allow instruments out of their factories in this condition.
Show me anyone who doesn't alter their instrument when they get it home. Everyone at least puts decent strings on. Most also set up the intonation and action which should have been done.
Surely any electric instrument should be shielded as standard!
They trade on their name, which often should be mud.
The cheapest components like pots, flimsy wiring, under-powered p-ups, bad earthing etc. all contribute to their failings.
We would consider it outrageous if a car manufacturer released vehicles which buyers had to 'trick-up' before they were driveable.
It is a scandal.