Intermittent dropping connection

Hello, I'm using an ARRIS SURFboard SBG7400AC2. I bought it brand new a month ago. Setup with Xfinity was a breeze. We have the Performance Pro Internet Plan (300 MB down/10 MB up).

I'm noticing dropped connections many times per day, and when I was gaming yesterday the connection dropped at least a dozen times within a few hours. At first, I was upstairs but had good signal strength, but it was dropping connections. So, I tried setting up my computer as a mobile hotspot and connecting the game system to my PC. Still dropped connections. Then, I moved downstairs around 10 ft away from the router and connected the gaming system to the router. Still dropped the connections. Lastly, I tried plugging in an ethernet cord directly to the game system, still dropped connections. I was the only person using the internet at the time.

When I run connection tests on my PC or gaming system, the speeds look fine. Just having problems with dropped connections. I've noticed it happens on smartphones as well, but not as frequently (I'm assuming because cellular data takes over and smooths the connection).

I've also tried rebooting the router. It hasn't helped. Speed test shown below. The speeds look great, I just need to get to the bottom of all these dropped connections.

Any help or advice is much appreciated.