As the title suggests, as the day goes on the Wifi connections get's progressively worse to non-existent. For example, I will reset the wifi on the phone and have 120mbs speed. After about two hours, the connection speed will be 500kbs to nonexistent and will not connect to apps / browsers that require internet connection.
The only way to fix this is by pressing the "Fix connectivity" button in the Wifi settings on the phone.
I know it is not the router as I do not have this problem on the other phone I had been using for four years on the same connection.