I posted earlier my AT Pro would not hold custom settings when shut off. Also seemed a little unstable. I bought it from Kellyco, but had it about a month so called Garrett and got a return label, but then decided to seek help from Kellyco through forum member "kellycochick" (Jamie). I could not be more pleased with the results. After exchanging several emails, she advised a new AT Pro was on the way together with a UPS label to return the old one. I got it in a couple of days and so far, all is well. My old unit was S/N series 511. The new one is series 512 and so far works flawlessly. There is a little more to the story about Kellyco. I first sought advice on buying a second unit as a backup if the AT Pro was going to be as troublesome as I was reading. It would have been easy to sell me something else and tell me to send my unit to Garrett, but that wasn't what happened. The backup unit was never mentioned - just a quick replacement to get me going again with no additional cost to me. I'm hoping this also means they believe that Garrett has made the necessary corrections to the product. Anyway, Kellyco has made a believer out of me, and I'm very appreciative of Jamie's help.