If you have Cisco 9300 model Ethernet switches and haven’t checked their OS versions lately, you should probably do that. Early releases of Cisco’s IOS version 17.x have an issue with flooding ports when a topology change is detected.

Topology changes like bringing a port up or down could cause flooding. When a port being used for WheatNet IP is flooded, the device connected to that port will most likely miss one or more network packets (potentially hundreds), resulting in loss of control signals and/or audio issues (including but not limited to distortion or dropouts).

Every port in your system should have the no ip igmp snooping tcn flood command applied. But even if this command shows up in your switch configuration, it is ignored in some versions of the Cisco operating system.