Today's 2.4G WiFi radio channel could be very busy and not quite reliable. Most of the WiFi devices are using 2.4G which makes the channels to be jammed sometime. Another reason to avoid 2.4G is because the indoor cordless phone and Bluetooth are also using 2.4G frequency which makes the situation even worse.
Comparing to 2.4G, the 5G channels not just offering better performance (faster speed), but also a more reliable connection between your media server, media renderer and control point because of the potential possible of channel jamming is much less.
When using 5G radio network, please make sure all devices in your streaming audio system are in same frequency.