I'm on a hard-wired connection.
The game, in specific, is Overwatch, but I also have issues with Twitch streaming and Netflix. There is a lot of lag, buffering, and dropped connections during this time making it impossible to use these applications.
Yes, there are multiple impacted devices. My wife has an identical computer to mine (same OS and identical hardware) that experiences the same problems at the same time and is also hard-wired into our modem.
Right now, we have a service technician scheduled to come out and take a look tomorrow, so I hope that goes well. It just seems very odd that it would something in my home since the issue is consistently between 8 and 9pm CST.
I appreciate you taking a look, Kevin. If you have any other advice, I'm all ears!