Freezes and the screen turns after stopping

Hello

I'm having a lot of trouble with my iMac, Retina early 2015, and I can't understand what is wrong with it. The problem is that if I use the mac for a period of time, it can sometimes be almost a whole day, at other times, it may be an hour. It has all suddenly freezes them completely and the only way to get it to work is to make a difficult stop (hold the power button until it turns off).

But when I try to turn the screen does not light. And I still have to make a hard, sometimes stop, it takes about 5 - 6 times before the screen lights up. And if the problem occurred once and I try to use the Mac immediately after, it freezes in the first 10 minutes, and the whole procedure must be repeated for another 10 minutes of use. The only way for it to not freeze is if I use it for like a day, but it gives me only about 3-4 hours before the problem occurs.

I sent it to a repair shop for repair, I thought that maybe it's the hard drive. They ran a few test Apple and was told that it is not the hardware, but the software causing the problem. Then they plant restores and gives back to me. But it does not solve the problem.

Any thoughts on what could be the cause of this?

It is impossible to say without knowing what siftware you may be running. A report of EtreCheck please http://www.etresoft.com/etrecheck

You can also do a physical check of base using Apple's Diagnostics using Diagnostics - Support Apple Apple

Tags: Mac

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