You are unlikely to find much support for such an old version.
I found the following advice
add this to your /bin/idea.properties
actionSystem.suspendFocusTransferIfApplicationInactive=false
Also make sure the latest version of JRE is installed.
Another, then my only suggestion is to upgrade to version 2017, which has various bug fixes (including this bug) and some great new features for OOP PHP.
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