Clion 2018.2.1 non responsive

Hi,
I am running Clion 2018.2.1 on 32 bit 4Gb Ram Ubuntu 16.04.
I am experiencing that the IDE becomes totally unresponsive on my CMake project.
The java instance for clion kept spinning at 40% CPU and 16% MEM usage.
The only option was to kill clion.
After a few restarts with the same result I first removed cmake-build-debug/ as created by clion. But it keeps unresponsive at the next start, albeit with Java at 5% CPU and 13% MEM.
How can I report you the situation/error in more detail?
Is there something like a trace/diagnose start flag to clion.sh?
Are there certain startup/config file I can try cleaning before start?

Thanks, Cees