Wifi connection issues

I have the sony z3v - and I'm constantly having to turn the wifi on my phone off and back on to reset the connection to my router. I'll be surfing the internet and all of the sudden I hit a brick wall and all forms of web traffic comes to a halt. The down arrow on my wifi icon stops responding, but the up arrow stays white and I lose access to the internet until I reset it on my phone (turning the wifi off and then on again). 4G never does this and I have no wifi issues with any of my other devices. Been searching high and low to figure this out, would be eternally grateful if you guys could help me.