Same problem on my 1yr old Galaxy S7... but only with my home AT&T Router.  All my other wireless devices (2 iPad, 2 PC) connect easily and stay connected.  Support said to reboot router, that do... See more...
Same problem on my 1yr old Galaxy S7... but only with my home AT&T Router.  All my other wireless devices (2 iPad, 2 PC) connect easily and stay connected.  Support said to reboot router, that does NOT resolve my repeated disconnects.  I told support this problem began IMMEDIATELY with the last System update, which had WiFi fixes in it... but they aren't listening.  Did they resolve your problem?