I might be a little paranoid about this, but there have been a lot of google searches happening on my account that I haven't made. About a month ago, gmail emailed me telling me that there was an anauthorized attempt at my account from china so in had changed my password and it is very secure. But in the past month there have been many google searches that in haven't made. Many of them are opening several pages in a matter of a few minutes. Is there anything that I can do to stop this or keep it from happening again? Would changing browser help?