Sounds like it's probably trying to inhibit sleep but uses the wrong way to do it that's meant for video playback and games and it just wakes everything up. Look for a way to disable that for this specific app.
I guess you can also
while true; do xset dpms force off: sleep 5; done
But that's just bleh for a solution.
If it can't be turned off, I'd just shove it into a container to isolate it and prevent it from doing that.