Where do I start when troubleshooting my Ace 250 ? The unit turns on and scrolls through all the settings. But it lacks depth and the ID is sometimes off. There is also a slight hum in all metal mode. It as been tested with a new coil and it worked good for awhile,.. then started acting up again. My main unit is a Garrett AT max and the Ace is my backup, loaner detector. Any ideas from you guys are welcome!

I have sent Garrett emails lately and got no response. I'm getting just a little frustrated.
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