Debris build up on the stylus?
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The clue that struck me is the possible/apparent interaction when you approach/leave the turntable.
This may be a variant of Grado hum, caused by its famously minimal shielding and susceptibility to electromagnetic fields. Your body may be affecting the surrounding fields in some way the cartridge is detecting. Are you in a location where static electricity has started to build up as colder/drier winter air approaches? That would tend to confirm the hypothesis.
Many people have issues with Grados on Rega tables due to proximity to the motor. Layering the underside of the platter with foil is sometimes said to help. Try that, can't hurt.
Missed the fact you're using a Gyro. Saw "Rega" and my brain turned a tonearm into a turntable. <;-)
I wouldn't zap a cartridge with a Zerostat. Don't know why, just doesn't feel like a safe thing to do.
Try wrapping little foil shield around the cart and headshell. Make sure it contacts the tonearm and that the arm itself is grounded. Easy to try and free. Or try another (non-Grado) cartridge if you have one handy. Might help you isolate the cause.