I use my TI-82 grapics calculator quite a lot (usually for programming), and I'm aving a problem with the variables, primarily the "Y" variable. When I put a store command for a real variable in a program, the calculator stores "0" to it no matter what. The problem usually occurs during the first 30 seconds of program execution. I try entering the command several times, and it still doesn't work right. What I'm mainly worried about is the fact that it hasn't done this when I first bought it. Will it get worse? Can I do anything to fix it? Does this indicate a serious problem elsewhere?