PROBLEM with my stability tgsl

[ashefr10]

hello, a friend has a problem with his tgsl. it is super unstable.
soon as one approaches his hand over his card and dice electronic beep qe he is touched the son of cabblages same thing. What can come of this?

[olecram1]

The search coil is confined in its box? The slightest vibration makes the equipment sound.

[Nandor]

There must be a problem with the cable and the coil shielding so the coil picks up any unwanted noise.