QT Creators frequent crashing with segmentation fault

I am testing QT-Creator trying to get into QT world.

The app crashes too much specially when I save changes to files Ctrl+S, files are already saved - after the crash I find my changes - but QT-Creator crashes more than 50% of times, whether it's a source file, qml, or pro file.

I doubt it was due to git plugin - actually one time it told me that it's crashing due to git plugin-, I've removed all `.git` dirs and disabled git and all version control plugins, initially it got a little bit better, but then it kept crashing again.
I run it from console; I've an error like this every time:

ConnectionServer error: "QLocalSocket: Remote closed" "/tmp/QtCreator-UbJKaV/ClangBackEnd-18086"
Segmentation fault