What is causing my WiFi issue?

[AC Question]

I have a Galaxy S6 on sprint network and recently upgraded to Android 6.0.1. Since the update I am able to connect to any WiFi I want, but sometimes I will not be able connect to the internet. All of my other devices work fine on the network. If I turn off WiFi I am able to use mobile data just fine.

I have found a way to fix this by resetting network settings but I have to do this almost every day now. This is getting annoying because I have to enter in passwords for all the networks I use and re-establish all of my Bluetooth connections.

Any thoughts?