My at pro pinpoint button started sticking sometimes but only while using it submerged. I simply started using the x method with the coil over the target to pp and stopped using that button in the water, it works fine when using it dry and I have gotten just as accurate pinpointing without using it in the water. Just a glitch with these machines, you could prob have it "repaired" but will prob do it again if you use it a lot in the water. I'm thinking micro sand particles get in around the rubber cover and won't let it come back up. If your machine is still under warranty it might be worth it to get it checked. If you do follow up on this with garrett will you update us with what they tell you? Thanks!