Multiple different BSOD

Hi, really hope someone can be my hero here. Have a new build PC, worked fine for a month, then constant BSOD, with all kinds of different error messages, including:

• IRQL not less or equal
• Driver overran stack buffer
• Kernel auto boost lock acquisition with raised irql
• kernel security check failure
• dpc watchdog violation
• driver irql not less or equal - what failed: ACPI.sys

The other notable thing about this: it never happens when playing games, only when...

Multiple different BSOD