Clamshell opens and closes, but top will not raise or lower.

[Kurt V]

I haven't found anything that discusses this with all of my Google searches. I have a 2003 Boxster S and up until now the top went up and down just fine. Today, I went through the lowering procedure and all that would happen is the clamshell would go up but the top would not move. I can manually lower the top and then push the button to close the clamshell. The same thing for raising it. I can push the button to open up the clamshell, lift the top back up and then push the button until the clamshell closes. I thought the clamshell and the top both worked off of one motor so I don't understand what is going on. Thanks for any suggestions the group may have!