CAL Delta Problem

Hi, My Delta Transport lately has started having a "mind of its own", in that the Drawer many times retracts back in automatically by itself. Sometimes very quickly, and sometimes after a few seconds. (Using either face button, or remote) At times it's a pain, and a guessing game loading CDs.

I sprayed the Switch with a bit of DeOXIt, and it seemed a bit better, but still on occasion does it. You folks have any ideas what the real problem might be? Thanks, Mark