I have charts that I created in Excel that I want to place in a Word document. However, I have never successfully embedded Excel charts as objects without a lot of issues so I've always pasted them as an image type.

Most recently I've pasted images into my document and they look immaculate upon pasting. I go back days later and notice they've lost their sharpness, as though they've been compressed and enlarged. I repaste the original image and they are fine again. Days later, same thing. Thinking they were JPEG artifacts I pasted them in as TIFFs. Again, looked good immediately but later not so good.

This is a formal document intended for a customer. I have to find what is causing this and stop it.

Ideas?