gti 2500 big coils issue

[LAISELVAE]

I can´t use the 12.5 imaging coil less than 8/10 inches from the ground (in some soils this is worst: 12", 14" even 20"), if I do I get the classic overload sound, well, this does not happen with the 9.5 "coils or the 10x14 dd, but I recently received a nel 12x 13 coil as a gift and something very similar happens although the distance is smaller, approximately 4/6 inches.

A few months ago this did not happen all the time, even in the same place sometimes happened and sometimes not, but now is all the time.

Can you suggest something?

thank you in advanced

 

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