All kinds of XFinity issues

Hi Gang. I recently installed XFinity internet and cable TV. I've had annoying problems with this WiFi. First my Wifes GalaxyS6 wouldn't connect. After an hour of googling, I installed the DNS SET app. And that works great for her, but needs to be activated every so often on her phone.
My S5 hangs every so often which is a pain in my nutz.
Even my laptop hangs, problems with Chrome connecting. I know this is more of a WiFi thing than an android thing, but I'm desperate for answers.
Can I return this gateway thing that I'm paying $10 a month for? If so what router can I use? Don't I need this *gateway* for Xfinity TV?
Anything you have for me is appreciated. I'm jumping through hoops to get reliable Wifi, and with the $$ I'm spending per month, I shouldn't have to, Uggh

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