Known Issue: Slow Wi-Fi performance with Android and Chromecast built-in devices
Summary of IssueIn certain situations, a bug in the Cast software on Android phones may incorrectly send a large amount of network traffic which can slow down or temporarily impact Wi-Fi networks. The specific impact to the network will vary depending on the router.
Who is impacted?People with an Android phone and a Chromecast built-in device (such as a Chromecast or Google Home device) on the same Wi-Fi network may experience this issue.
Solution and next steps
The team has identified the issue and is actively releasing a fix, which will start rolling out via a Google Play services update this Thursday, January 18.
ln the meantime, try rebooting your Android phone, and check that your Wi-Fi router is running the most recent firmware version.