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What is causing leaves on my corn plant to lose colour in sections?

I have a large corn plant. It is extremely healthy except in the last couple of weeks i have noticed a few lightened spots on 4 leaves. It is like the colour is drained out of them. There are no signs of insects or webs or and powdery substance. It has not been moved in over 6 years. It sits in a south east window and is sheltered by sheers on the large window. This condition is happening about 6 leaves up from the bottom. Do you know what it could be or how to fix it?
Submitted by lynda1anddavid2