When I open "Navigate to file" by CTRL+Shift+n with text typed in then window is disappearing. I need to hit CTRL+Shift+n several times to get working window. My friend also has similar issue.
Build #PS-172.3544.41, built on August 2, 2017
JRE: 1.8.0_152-release-915-b6 amd64
JVM: OpenJDK 64-Bit Server VM by JetBrains s.r.o