Video Calling always dropping? My speed always says 100% or laughably over

I get severe connection issues when I'm on zoom since I've moved (streaming will rarely get a circle of death, a sometimes web browsing gets too heavy). My router is right on the other size of the wall from where I take these video calls. There's no mirror, no furniture, just the a wall. But I live in an apt. I rent the xfi gateway since they suggested that when I was having issues at my old place (rats had actually chewed through a cable & other problems--I digress). But it's just impossible to take a video visit without at least 1 interruption, but often many. My wifi just can't handle it. What's with that? Can I do anything? I did have maintenance come out once when it was really really bad (they didn't come to my apt but my complex strangely enough, so I think it was a cable issue) and then everything was smooth for like 2 weeks. 

The app just keeps telling me nothings wrong. And I don't have time to turn off my wifi over and over and spend hours on the phone with different customer service bots and live agents every time this happens again for months until this maybe gets solved, that's what happened at my last house until i just nailed a lan cable to my ceiling leading from my router to my bedroom so I could have wifi on my actual computer. 

I'm sorry, I'm just so tired and frustrated. I had a job interview and the call dropped last week and I was so red-in-the-face embarrassed when I came back on that I stumbled over my words and felt disoriented. I shouldn't have to live like this when I pay this much for wifi, should I?