Has anyone ever had a problem with the pixels randomly not lighting up in the radio display? For example, where it shows RND for random, a few are missing up the middle of the N. At the same time, there's a few missing in some other spots all over it. I've noticed it only a few times so far, but I don't drive a whole lot. In Tampa the temperature has been 80 in the day and 50s at night, not sure if this could be temperature related. Any ideas?