Share 'Problems with length of code?'

I have written some code (My main file is about 250 lines long) and I have been trying to test it. If I comment all except the first little bit of my code, it performs exactly as I expect when I test it on the LCD and keypad. Naturally then I uncomment a little bit more, and when I try to test it, part way through the operation, it reverts back to the beginning of the code.  I was thinking there…