My MFC-L2700DW was dropping connection after 10 minutes after I setup. I would have setup from scratch more than 25 times.
After reading this page, I tried NETWORK, WIRELESS, TCP/, IPv6, then clicked Enabled. No wireless connection dropout for 12 hours then it said "Check connection". Then all I did was, restarted the printer. Since then (a month ago) there is no connection loss! Great relief. Thanks everyone.