Multiple freezes and crashes - no real trigger

There is too much delay between data, the errors occur at the northbridge.
Please check your motherboard manufacturer for updates to start with, driver and BIOS updates.

Code:

===============================================================================
Section 2     : x86/x64 MCA
-------------------------------------------------------------------------------
Descriptor    @ ffffe001cefbf148
Section       @ ffffe001cefbf2d0
Offset        : 664
Length        : 264
Flags         : 0x00000000
Severity      : Fatal


Error         : BUSLG_GENERIC_ERR_*_TIMEOUT_ERR (Proc 0 Bank 4)
  Status      : 0xfe00000000070f0f
  Address     : 0x00000000feaffdb8
  Misc.       : 0xc00a0fff01000000

Code:

Event[8943]:  Log Name: System
  Source: Microsoft-Windows-WHEA-Logger
  Date: 2016-01-04T21:08:58.589
  Event ID: 20
  Task: N/A
  Level: Error
  Opcode: Info
  Keyword: N/A
  User: S-1-5-19
  User Name: NT AUTHORITY\LOCAL SERVICE
  Computer: Keynun-PC
  Description: 
A fatal hardware error has occurred.


Component: AMD Northbridge
Error Source: Machine Check Exception
Error Type: HyperTransport Watchdog Timeout Error
Processor APIC ID: 0


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Not exactly, the northbridge is the last part of the chipset the data goes through before it is being passed to the CPU.
This means that any other part can be causing it if updating the chipset and BIOS doesn't help,

• hard drive
• GPU
• slots,
• cables,
• drivers,
• improper seating of a component,
• motherboard as you said,
• dust,
• software like daemon tools or software that comes with the mainboard or pre-installed

It is a only a small part of things but pretty generic that can cause it.

The problem with the 0x124 is that it often doesn't give enough data for specific troubleshooting and there are just so many things one can try to fix it.