To update with the latest response I’ve gotten from avast! Support on this matter:

The problem isn't on your, or our side. It's Google Cloud to Device Messaging - a service provided by google that we use to communicate with the installation. Sometimes the command messages don't make it to the device and the command just times out. Or the command message arrives at the device, the command is executed - but the return message (confirming the reception) doesn't arrive at the server. It's actually a google problem - we can hardly improve this.