The magsafe 2 connector on my 2012 13-inch MBA becomes disconnected quite easily. Is this a function of the design so when you trip over the cord you don't pull the entire laptop off a table or wherever it may be? Sometimes when I'm lying in bed it just comes unplugged if I move around a little. Is this something I should take it to the Apple Store to have checked out? Also, if I should venture to the store, should I go today (Sept. 20) or will it be way too crowded with the iPhone launch and thus impossible to get help?