Control Center requires regular updates to maintain functionality with ever-changing source devices. If you attempt to download and install, but are unable to complete a software update for any reason, it may be caused by an inconsistent or weak network signal.
Try switching between wifi network and hard-wired ethernet connection. You might also try moving the unit closer to your wifi router. If you are still unable to complete a software update, another option would be to join a different network altogether (like a wifi hotspot from a mobile device).