I just had the same experience with them.after trading a guy from this site,who I won't name,my x4 for his x4d this past winter,I went to use it last week and I wasn't getting a down temp.i called fish hawk and explained what was happening.karen right away said it was the probe,she said the same thing,I will ship you one out today and 2 days later I had it.i guess the probe must have broke sitting in my closet over the winter.