I've had my DPP for a year or so.
Last month I got it out of the safe after a 3 month break and the dot would go on and off during recoil.
Swapped the batteries out and it was fixed.
On the weekend it would go on and off during recoil again.
Swapped the batteries out and it was fixed.
The spring under the battery has a bit sticking up out of the centre and this nipple shaped piece seems to be eating away the coating of the battery, leaving a dot in the centre where the shiny coating of the battery is removed. This disconnects the circuit I suppose.
Is there a way to prevent or slow this down? Batteries are cheap and easy to replace but it is a bit annoying.