I started having an issue with my excal II. About once every three to five minutes it lets out a quick loud squeal (like when you hit a soda can). The first thing I did was to change the battery, no luck. Next I played with the sensitivity and still no luck. I always hunt with zero disc. and the sensitivity around 1 Oclock. I decided at this point to hunt in all metal mode and it still squealed. I still was able to hunt and recover targets but needless to say it started driving me nuts after an hour or so. Any help would be appreciated! Thanks.