Kaspersky Total Security users have been complaining since January about antivirus conflict with Chromecast. And some did not even know that there was such a device in their network.
When you open the Chrome browser, the antivirus started to warn you that the domain has a self-signed certificate, and Kaspersky cannot guarantee the security of the connection.
There's been a sudden increase in device discovery reports. Reviewing the reports indicated that it's common on the Windows platform. And reviewing of the logs show a commonality of cast channel authentication errors, which can often be attributed to Anti Virus / security software.
Original Bug Report
The development team sorts out this bug on the Chromium site. They say that they will solve the problem together with Kaspersky Lab.