Qt Creator UI with long freeze

Hello I got a problem with Qt Creator since some months.

When using Qt Creator, sometime, it start to analyse c++ files, and sometime QtCreator become unresponsive many seconds, I would say freeze even many minutes most of the time.
When it occur (Several time by day) monitoring the threads of QtCreator with Process explorer (I give you 2 screenshots) it seems AST threads locking Qt Creator UI.
When all of them (analyzing AST) are going away, QtCreator unfreeze, and I can continue to use it.

But to wait many minutes waiting to unfreeze is very very blocking/frustrating.

Inside QtCreator:
I got 12 .pro open and working inside one of them. (About 100 files inside each)
Most of the .pro share the same files for compiling.

Thx for looking into it.

Ti-R