Some devices may hang or freeze when using certain apps, such as “Hey Cortana” or Chrome, after installing the Windows 10 April 2018 Update - Microsoft Community

Microsoft is working on a solution with the goal of including it in the next regular monthly update, currently targeted for a release date of May 8, 2018.

Cortana さん使っていないから“Hey Cortana”は知らないけど、Google Chrome は我が家では問題なさそう