I forwarded your message to our Operations department. This is not the first complaint they've received about the sound system and are taking note of which sections were affected. I don't know 100% that it will be fixed by this coming Sunday's game-- but I know they are looking into it and are working on it.
If you have any other questions or concerns, please let me know.
Customer Service Representative
Washington Redskins Ticket Office
1600 FedEx Way
Landover, MD 20785