found a solution, at least for my LG G3. i always have wifi and gps on (from the drop down menu setting), but there are 3 GPS modes if you dig deeper.
go to settings, then location, then click MODE.
mine was set to "Device Sensor Only", i changed it to "Battery Saving" and set a reminder for home (while i was at home). the reminder came up within a couple minutes.
"high accuracy" also works. not sure how much more of the battery it will use though.
let me know if it worked for you