Went out to an old very well hunted park and was having a pretty decent day with a SLQ and 2 Mercs,when all of a sudden,the volume on the machine started to from extreme low to extreme high within every swing.Shut it down,restarted still the same.I thought it might the headphones-I don't use the wireless,but next day ,I went out with my Explorer II,and the headphones were fine.It's frustrating,I spent all this money for this unit expecting no issues on a new machine.I spent $450 on my used Explorer almost 7 years ago and never had a moments problem after hundreds of hard hours of use.Does anyone have any ideas what the issue might be or I'm going to have to send it in to Minelab?