I received a new model 75077A3 Weather Forecaster 3 months ago. I noticed the outside temperature was unchanged for several days, despite a wide variation in temperatures. I tried all of the suggested troubleshooting approaches from the manual and those I found on-line on your website, including the installation of new lithium AA batteries on the external sensor, switching both the external sensor and base unit to "C" and reinstalling batteries and nothing seems to work. By way of feedback, your telephone support is very, very customer unfriendly! I have consistently been number 27 in the cue which makes for frustrating and unsatisfying customer experience!