Users in the Google and Reddit help forums report that Google Home and Google Chromecast devices are causing problems with their Wi-Fi networks. Users say that connecting these hardware products from Google leads to an unstable Wi-Fi network or a network that goes down completely.
Instability was originally intended to affect the TP-Link Archer router series with a single Google device, Google Home Max. However, the problem has been slowly spreading to other devices, with Google Home, Google Home Mini and Chromecast apparently having similar problems. TP-Link was selected because it is a popular brand of routers.
TP-Link issued a beta patch for the Archer C1200, but the company came to the conclusion that the problem is not in its routers. In a supporting article, TP-Link writes:
After the initial research and investigation, our engineering team is confident that they have identified one of the key origins of the problem. Based on what we've collected so far, the problem seems to be related to some of the recent versions of Android OS and Google Apps.
This problem arises from the "Cast" function of these devices, which sends MDNS multicast discovery packets in order to discover and maintain a live connection with Google products, such as Google Home. These packets [are] are usually sent in a 20 second interval. However, we have discovered that the devices will sometimes transmit a large number of these packets at a very high speed in a short period of time. This occurs when the device is activated from its "inactive" state and can exceed more than 100,000 packages. The longer your device sleeps, the greater the burst of this packet will be. This problem can eventually cause some of the main functions of the router to shut down, including wireless connectivity.
For now, disconnecting your Google products from the network or disabling the conversion functionality seems to solve the problem. A Google spokesperson told Engadget: "We are aware that a small number of users have problems and our team is working quickly to share a solution."