Wondering what is causing the water supply line to the icemaker to always freeze up. I've already defrosted it with a hair dryer, but eventually the line freezes up again. The line is freezing up inside of the freezer right at the connection. I want to know what part(s) is/are not working properly and causing the line to freeze. I know this is why the icemaker is not working, I just need to know how to fix it.