Computer freezes randomly and nothing seems to solve the problem

Hello.

I have been surfing the forum and tried a couple of possible solutions to my problem, but the problem persist.

See, my computer (custom build) freezes randomly, it started happening a few months ago. It only hapends when I surf the web, windows or watching youtube videos (most of the time happens while watching youtube videos), but it is not happening while playing hard games (like fallout 4, metal gear 5, Skyrim ultra modded).
Nothing respons so I have to do a hard reebot

Things I tried so far.

1. Serch for virus, malwares and spywares.
2. Make a clean install of the OS (also tried windows 10). I tried clean copies in all my hard drives devices.
3. I tried several CMD commands that microsoft told me to run.
4. I checked my RAM with memtest and also starting my PC unpluging sticks and also swiching slots.
5. Checked all hard drives with CHKDSK
6. Updated all my hardware drivers (and using the old ones)
7. Updated my BIOS (from 11.01 to 12.01)
8. Dismount and clean all my hardware (from dust and all those kind of things)
9. Replaced the thermal paste
10. Check every single wire
11. Checked all the PC temps with CPUID
12. Power supply works
13. Used CCleaner and tuneUp utilities
14. Used sfc / scannow command

I am sure I am missing more thing i've tried.
I really dont know what else shall I do to solve this problem (also didnt know where to post it)
Thanks!

PS: My system specs

CPU: AMD FX(tm)-6300 Six-Core Processor
Motherboard: ASUSTeK Computer INC. M5A78L-M LX3
BIOS: BIOS Date: 04/19/13 13:04:40 Ver: 12.01
HDD: (1) WDC WD10EARS-00MVWB0 ATA Device (2) WDC WD10EZEX-07M2NA0 ATA Device
Sound card: (1) AMD High Definition Audio Device (2) Realtek High Definition Audio
Graphic card: AMD Radeon R9 300 Series


EDIT: I get a lot of new information, never happened before. Yesterday the computer freezes and (like an hour after) it rebooted itself and those error logs and information is what I manage to get.

A windows pop up about the unespeckted crash of the system saying (it is in spanish, i'll try to translate)

Firma con problemas:
*name of the event*
Nombre del evento de problema: BlueScreen
*OS version*
Versión del sistema operativo: 6.1.7601.2.1.0.256.48
*Regional configuration ID*
Id. de configuración regional: 3082

*Aditional information*
Información adicional del problema:
BCCode: 124
BCP1: 0000000000000000
BCP2: FFFFFA8007E51038
BCP3: 0000000000000000
BCP4: 0000000000000000
OS Version: 6_1_7601
Service Pack: 1_0
Product: 256_1

*aditional files*
Archivos que ayudan a describir el problema:
C:\Windows\Minidump\020216-23041-01.dmp
C:\Users\Federico\AppData\Local\Temp\WER-52041-0.sysdata.xml

Lea nuestra declaración de privacidad en línea:
Declaración de privacidad de Windows 7 - Microsoft Windows

Si la declaración de privacidad en línea no está disponible, lea la declaración de privacidad sin conexión:
C:\Windows\system32\es-ES\erofflps.txt

I attached the .dmp file

WhoCrashed gave me this message

On Tue 02/02/2016 7:03:52 GMT your computer crashed
crash dump file: C:\Windows\Minidump\020216-23041-01.dmp
This was probably caused by the following module: ntoskrnl.exe (nt+0x4B356C)
Bugcheck code: 0x124 (0x0, 0xFFFFFA8007E51038, 0x0, 0x0)
Error: WHEA_UNCORRECTABLE_ERROR
file path: C:\Windows\system32\ntoskrnl.exe
product: Microsoft® Windows® Operating System
company: Microsoft Corporation
description: NT Kernel & System
Bug check description: This bug check indicates that a fatal hardware error has occurred. This bug check uses the error data that is provided by the Windows Hardware Error Architecture (WHEA).
This is likely to be caused by a hardware problem problem. This problem might be caused by a thermal issue.
The crash took place in the Windows kernel. Possibly this problem is caused by another driver that cannot be identified at this time.


And the event viewer those other messages.
CRITICAL:
Kernel-power
Se reinició el sistema sin apagarlo limpiamente primero. Este error puede producirse si el sistema dejó de responder, se bloqueó o se interrumpió el suministro eléctrico de forma inesperada.
*System hard reboot. Maybe for not response, blocked or power issue.*

ERROR:
WMI
No se pudo reactivar el filtro de eventos con la consulta "SELECT * FROM __InstanceModificationEvent WITHIN 60 WHERE TargetInstance ISA "Win32_Processor" AND TargetInstance.LoadPercentage > 99" en el espacio de nombres "//./root/CIMV2" por el error 0x80041003. Los eventos no se podrán entregar a través de este filtro hasta que se corrija este problema.

WHEA-logger
*not recuperable hardware error*
Error de hardware irrecuperable.
*component*
Componente: AMD Northbridge
*Error origin: Exeption of system comprobation*
Origen del error: Excepción de comprobación de equipo
*Type of error: Stand-by time error of HyperTransport guardian*
Tipo de error: Error de tiempo de espera de guardián de HyperTransport

Comprobacion re errores
*System reboot after error comprobation*
El equipo se reinició después de una comprobación de errores.
*The comprobation was:*
La comprobación de errores fue: 0x00000124 (0x0000000000000000, 0xfffffa8007e51038, 0x0000000000000000, 0x0000000000000000).
*Saved in: *
Se guardó un volcado en: C:\Windows\Minidump\020216-23041-01.dmp. Id. de informe: 020216-23041-01.

EventLog
*The previous system shut-dawn was at: "date" was unespected*
El cierre anterior del sistema a las 3:43:51 del ?02/?02/?2016 resultó inesperado.

WLAN-Autocongif
*The module of extensibility WLAN couldnt be repaired*
El módulo de extensibilidad de WLAN no se pudo iniciar.
*Rute of accec*
Ruta de acceso del módulo: C:\Windows\system32\Rtlihvs.dll
*error code:*
Código de error: 126