TO ALL WHO ARE HAVING THIS SAME PROIBLEM:
In order for us to taylor our comments and recommendations to your specific problem do what rkaufmann87 has recommended: create your own topic, state your problem, describe your hardware specifies, the system version you're using and any fixes you've tried.
Also please download and run Etrecheck. The free version is sufficient.
Copy the report as shown in this animated screenshot
and use the Additional Text button to paste the report in your reply.
Then we can examine the report and see if we can determine the cause of the problem.