Hello Steveba, I have experienced changes in the performance of my Quattro due to I believe changes in weather conditions. For example, one day at the beach, everything's running smoothly with my detector, picking up targets, no falsing, etc. Next day, at the same beach, the detector is making a lot of background sounds as if there's some sort of mineralisation in the ground, and there's not. But the weather conditions have changed, maybe to being a little more breezier, colder, and I often get the feeling there must be some sort of electrical current in the air, that the detector is trying to read through. So yeh, the after effects of the thunderstorms you just had could quite feasably have some effect on the detectors. That's not to say that you can't detect at all in this weather, but it sures seems to have you on the edge of utter concentration! As I'm not very technically minded when it comes to things like that, I was hoping that someone out there might be able to give me a logical explanation as to why this occurs with the detectors, but as yet, no one seems to have an answer. And it's not just the Quattros or Explorers that have the same experienced this, I have a mate with a Sovereign, and he says he'd experienced the same thing, but not to the degree I have with the Quattro. The Sovereign seems to run smoothly at almost any time. The Explorer seems to be the worst for it, perhaps due to all the extra bells and whistles capabilities of this machine, so reading through the ions in the air, makes it seems more irratic. If you ring someone from the customer support group at Minelab, make sure you get onto to a technical advisor, some one who understands the circuitry and nuances of it.
As a general rule from what I've learned, windy days, even very cold temperature drops, seem to effect the detector somewhat sometimes. The detector seems to perform better on temperate to warm days, even hot days are great for getting out, though not everyone likes the heat!
Golden