Google is rolling [google.com] out a patch today which will fix a bug that slows down Wi-Fi networks connected to both Android and Chromecast built-in devices. According to a blog post [google.com], Google said a bug in its Cast software on Android phones may incorrectly send a large amount of network traffic, which can slow down or temporarily impact Wi-Fi networks.
[...] Google says it has identified the issue, and the fix will be issued via a Google Play service update. The company says users experiencing the problem should reboot their phones and check that their Wi-Fi router has been updated with the latest firmware.
Source: TheVerge [theverge.com]