What model are you using, Dave? I have been using the old 1503CPH for a couple of years, and it performs absolutely flawlessly. I have a 1200GPH also, and have noticed a few weird quirks with it. I haven't seen anything like you're talking about, but it just doesn't seem to perform like the 1503. The 1200 I have is one of the very early ones, and I had to manually reset the autotune when it completed. I'm going to put the permanent probe in my Model 1 and really dig into this unit. I'm not sure what Auber changed in the programming, but they need to go back to what worked with the old model.