RBR20 competing and not working with Spectrum Router

I bought my Orbi RBR20 system from Costco a few years ago, it came with router and 1 satellite. I have had Spectrum since it was Time Warner. I have recently been aware that I have 2 WiFi’s and I was very confused. I work from home and I do most of my work in the garage hence the reason I wanted the Orbi, I thought it was just an extender at first. But I have a problem with my WiFi going in and out and sometimes my phone works better off the WiFi. I know that with spectrum I have a modem and a router and I have my Orbi plugged into my spectrum router and I have Orbi satellite in my breezeway. All of my networks have the same password but my Orbi has a diff network name because I was told that was the best way to do it from spectrum at the very beginning. I am guessing that I am having problems with connection because my routers are competing with each other but my question is idk how to change it….and idk which one is better… I don’t really care about guest networks and I use the WiFi heavily for all the tvs in the home for streaming and all the phones in the home as well (4 tvs 4 phones) I pay for upgraded speeds through spectrum because I need fast speeds for work but its all Ethernet for work not WiFi so that may not matter, I’m not the smartest when it comes to this internet stuff.