Anyone here got uverse on fiber optic?

New house, had to run fiber to house from street. Since my house is not wired fiber only the modem is hard wired, everything else is wireless. Speeds are fine when it works. Appears to loose connection and pages/videos don’t load on devices and sons PlayStation lags.

Tech blames issue on us changing the name of our network and using a password we can actually remember. Then he informs us at&t routers suck and we should go buy one from a store. Anyone ever heard of such BS? I allowed him to set router back to factory network name and password which of course did not resolve the issue. I’m all for kicking their ass out my house, but to my knowledge they are the only game in town other than some type of satellite service.