This year when using my X67 and set the lower range limit, it jumps to a lower setting. For example, if I'm in 12' of water and want to set the lower limit to 15' it accepts it, but in a minute or so, it might, on its own drop to 30' and then a short time later will jump back to 15'. It continues to do this flipping back and forth. Aggravating. When using it last year I had no issue. Just something that happens this year.