Whites Prizm Pinpoint problem

[mdetectors.com]

Hallo Dear Freinds,
we have some problems with Whites Prizm /Coinhunter/ model.
After some time pinpoint go down, but the metal detector works withowt any problem - only pinpoint take loud permanent sound.
Are you familiar with this problem?
Do you know how ti fix it?
Thanks in advance!

[WM6]

Hallo Dear Freinds,
we have some problems with Whites Prizm /Coinhunter/ model.
After some time pinpoint go down, but the metal detector works withowt any problem - only pinpoint take loud permanent sound.
Are you familiar with this problem?
Do you know how ti fix it?
Thanks in advance!

Remain this the same after repeating OFF/ON?
Did you check if coil is clear: no metal or metallic ore like dirt stick on it?
Did you replace coil screw with metallic one?
Did you try to replace battery?

[mdetectors.com]

I use diferent search coils on a clena area.
Strat-stop, but the same plroblem, whan i press Pinpoint only permanent sound appear.
Batteries which the buyer send were on 9,5V

[WM6]

I use diferent search coils on a clena area.

V

In this case as next check if shield wire from PCB to connector (pin) inside box was somewhere poorly connected or disrupted.

[mdetectors.com]

ok i will try and will inform