Let me apologize for any inconvenience.
The fact that you tested the processor on a different motherboard and the issue is still present is only indicating that the processor is the issue here. So, at this stage I would recommend checking the replacements options for your unit, below you will find the support options.
EMEA contact information: http://intel.ly/28QeAF3
APAC contact information: http://intel.ly/1ITfjUF
LAR contact information: http://intel.ly/29c0rW4
North America: Phone Number 1-916-377-7000, Business Hours: Monday - Friday 7:00 AM to 5:00 PM (Pacific Time).
Please let me know how it goes.
The computer belongs to my brother in law, and since the day after I wrote this topic, the pc it is working fine. I will wait a little bit, and if the problems come back, I will replace the unit, and if I have problem doing this, I will let you know.