Okay I was doing some beach hunting at Gulf Shores last week. While in the Dry sand far away from the saltwater I was using Beach mode Md and was experiencing chatter with VDI varying around 11, sensitivity was 26. I switched while still in Dry sand to Mw and chatter went away. Anyone experience this? I am no longer at that beach so can not try different settings. I didn’t find much but a couple of coins in two days of hunting. My machine is at factory settings.