Intermittent 20-30 second drops in internet connection (both wired and wifi)

I am using a 5268AC router. Since about last week, I have been experiencing random, intermittent drops of internet service lasting no longer than 30 seconds. I notice them almost exclusively when gaming, mainly because the drops are just long enough to disconnect me from any chat and game server that I am connected to. I have not noticed this significant/abnormal issue while consuming any other media or doing anything else on the internet (video calls, ParSec screen sharing, etc). I have an Xbox and a gaming PC both ethernet connected via a powerline adapter. I have never experienced these problems before with said adapter. My immediate belief was that I was seeing a problem with the powerline adapter, but I have reset it, checked the firmware updates, and changed ethernet cables to no avail.

In order to try and isolate the issue to the powerline, I ran ping tests on my laptop connected via WiFi and on my PC to see if the disconnect problem manifested simultaneously. At the exact same time that the internet dropped on my hard-wired Xbox and PC, the internet also dropped on my laptop for that brief window and then immediately reconnected. So it appears to be an issue impacting the entire service, not just the powerline. In summary, the following devices all experienced an internet outage of 30 secs at the exact same time: An Xbox Series X (ethernet), a PC (ethernet), a Macbook Air laptop (wifi).

Other things I have tried:

Resetting the router
Checking router software is up to date
Checking connections

Not sure what to do about this or what could be causing it. Any suggestions on cause and how to fix it