This is a common problem. Sharp accidentally made some of the keyboards with the wrong glue and this is the sort of symptom they give. There is a recall on them, so if you advise your dealer, they may replace it for you.
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For those of you looking for Sharp XE-A203 manuals plus many other models, try here:
http://the-checkout-tech.com/estore/catalog/advanced_search_result.php?keywords=203&osCsid=59c159667291fd9a91f928437b60ad84&x=0&y=0
Mark
May 2010