wolfsburg, you don't say exactly what machine you currently have. The "coinmaster" term can apply to MANY different whites over the years, as that was the lead-in to whatever suffix was in the name, for various models. And you don't say what model you used to have. Both factors might help someone in making a good guess as to what's happening (ie.: what you may be doing wrong).
Assuming you have a motion discriminator now, you may be making this mistake: slowing down over the target, once you've heard it, to hone in on it. You have to keep motion in that mode (the faster the better) to continue to hear it. Or do you loose it in pinpoint/all-metal too?
I've heard of the above example being the solution to someone's "disappearing signal". Another time a guy was unknowingly detecting the tips of his steel towed boots. Another time a beginner I hunted with was unknowingly detecting a pipe that went down inside the corner of a building (he kept getting a signal at the exact corner bottom, and wasn't aware that the tip of the coil was sensitive too. He just assumed the target was
down). Another time I saw a guy assume any little "blip" he heard must be a signal, but he failed to realize that unless it "repeats" itself in the same spot over and over (might have to do 90* angle cross-checks, and get it centered underneat your coil center to be sure), it could have been just a flutter, and not an actual target (turning down the sens. would help eliminate that).
Another possibility is that the target drops down deeper into the hole, and now it's too deep to hear when you re-swing over an open hole .
The possibilities are endless. If I was you, I'd hook up with a proficient user (not just a sandbox hunter), and show him some of these disappearing signals, both before and after you go to dig a target. Also watch and listen to flagged signals as he detects, so you can see how he swings, how he isolates, what he's listening for, etc... The reason for this is, it's hard to describe in printed text, things like sounds, since that is so connected to diagnosing something like "dissapearing signals". In a lot of the above example diagnosis, the person reporting the "dissapearing signal", was adament that he was/is doing nothing wrong, and that it therefore must be the machine. And no amount of phone conversation of printed text could convey what was really going on, till the experienced user went out and checked those same signals, looked at how the guy was hunting and pinpointing and digging, what the control settings are, etc..
Another humorous example of the above "must be seen/heard" diagnosis: A dealer friend of mine rented a machine to a customer. A day later, the customer comes back complaining that it "beeps all over everywhere". The dealer checks the machine in air tests, and shows the customer that it is working properly, and again shows the customer how to use the controls, machine, etc... But AGAIN the customer comes back later to insist "no, it beeps everywhere, all the time, and doesn't even begin to have a threshold like you so easily show in an air test, so it's obviously broke and doesnt work once it's used in actual ground". At this point, the frustrated dealer asks the customer "what are you looking for, and where are you using it?" The lady tells him that she's using it in her backyard, in terra-firma ground (not concrete, or inside a building, etc..) to look for something the family thinks was buried back there by her deceased husband. The dealer then offered his services to simply do a manned rental, and do the searching for her himself. The lady agreed, and went on to explain that her husband invested in silver coins for many years before his death. When he'd get each months' social security check, he'd take a few hundred $$ of it out each time, and go buy common silver coins. While he was alive, she'd never really paid attention to his innocent hobby. But upon his untimely death, she realized that the closet location where he'd had all his coin collecting books, and jars of coins, was seemingly very scant, compared to the quantities he'd been buying over the years. So the family searched the house, and all possible hiding places, to no avail. Years went by, and finally she sold the house and prepared to move out. As they were dismantling a green-house in the backyard, she spotted a silver coin or two in the dirt. On a hunch, she began to dig around in that spot, and discovered a corroded sock FILLED with silver coins, that had been buried there, and had broken open after the sock corroded over the years. She then began to wonder if her husband might also have buried other stashes of coins in the yard, leading her to rent the detector
So the dealer shows up at the yard on the appointed day, takes out the detector, and makes his first swing. BEEPS EVERYWHERE just as the lady had said. But my dealer friend is a bit more skilled than this, and immediately recognized that these were not random beeps, but that they were all individual signals. Yup, you guessed it, coins all over the yard. He had burried so many socks of coins over the years, that had subsequently been spread around during rototilling, that they were now simply everywhere. For 2 days my friend dug a few thousand silver coins from that small back yard, including some still intact stashes.
The point in the above story, is that no amount of printed text, or sales counter instructions, could properly convey the lady's error, or replace real world showing of how to do it, what you're supposed to be listening for, and even showing someone signals to avoid or pass.
