I've found the problem.
the **Megasync** for linux, also I've tested the **megasync (amd64 - version 2.9.10-25.1)** in _kali linux 2.0 2016.2 light and have the same problem_
**What is the problem with megasync? Causes froozen folder of nautilus interfaces (In random times)**
Unistall megasync or kill process when have a problem
sudo killall -9 megasync
Greetings!