Extremely painful WiFi problems

Since the June security update my Nexus 6P has had terrible wifi connection. Like to the point where I want to throw the phone out the window. YouTube videos pause to load about every 5-10 seconds, browsing the internet is painful. Once I switch over to network data there's no issue and I obviously can't just stay on network data. It's not my router because nobody else in my family has any problems. Does anyone know what I should do? I waited until I downloaded Nougat (which was today) to see if that helped but it didn't fix anything. Oh and also, when I turn my wifi on I have to go into the settings and press the on/off switch about 10(sometimes more) times rapidly before my phone recognises that there are wifi signals. If I don't do that every time then my phone won't connect. If anyone knows how to fix this please let me know. Maybe I should just contact Google directly?