I have a TOSHIBA Satellite L775 laptop that is four years old. I've been having an issue for the past five months or so where my E key sometimes doesn't click in, sometimes omitting an E in my text, or does double E's if I click it. It is very annoying and I'm not sure what to really do. One source on the Internet said replacing the battery might help, but if not a technician should be consulted. What should I do?