If you have the option on your Roku device, go to the audio settings and see if you can change the audio options, such as to sport/game or there are other options in the audio settings that will help. The app may also have audio options as well, if you hit * in the app, you can see if there are options there.
If you have a stereo receiver or sound bar hooked up, you may also have options to switch audio as well that will help with that. Sometimes though, the crowd is just so loud, it drowns out the announcers as I have had that happen even with a surround sound receiver.
Welcome to the Roku Community, @KurtAyres!
We appreciate you bringing this matter to our attention. To assist you more effectively, could you please provide additional information about the issue? Specifically, we would like to know if it occurs on a particular channel or elsewhere.
Additionally, we recommend performing a system restart, which can be done by navigating to Settings > System > Power > System Restart.
Thank you for your cooperation, and we look forward to resolving this for you!
Best,
Jharra