the temperature drops below 45 degrees F. Happens when I'm pinpointing, when the display keeps changing. Can't read it because only half of each character is showing. When I'm swinging the coil the display is stable, all the characters are readable. Seems like the meter can't re-act fast enough in colder weather. Any other Cortes owners have this problem? Have new batteries in it. Owners manual say operating temperature is 30 to 100 degrees.