Start with evidence from your own machine before swapping any part. Below is an ordered, South African gaming checklist for the symptom in the heading, written so each step is something you can verify yourself before booking a repair or buying a replacement.
Quick Answer
Start with evidence from your own machine before swapping any part. This usually comes down to heat, a bad BIOS setting or background load rather than a faulty gaming PC. Run a fixed 20-minute test after each change and keep the one that holds at a steady frame rate or a stable temperature under 85C.
Temperatures under load
Reseat the cooler and apply a fresh pea of paste if temps spiked after a recent strip-down. Confirm the case has a clear front-to-back path and that no cable is resting against a 120mm or 140mm fan.
Software and firmware checks
Check that a recent Windows feature update did not swap your tuned driver for a generic Microsoft one overnight. Check that a recent Windows feature update did not swap your tuned driver for a generic Microsoft one overnight.
Power plan and supply
Verify the PSU wattage matches the load; a high-end card wants real headroom, so a 1000W unit is a sensible floor for top builds. Verify the PSU wattage matches the load; a high-end card wants real headroom, so a 1000W unit is a sensible floor for top builds.
FAQ
Will a BIOS update fix this on its own?
Sometimes, but flash only the latest stable release and reset to defaults afterwards. A fresh BIOS plus a clean chipset driver clears a surprising share of post-update stability faults.
Is the gaming PC actually the problem?
Not until the software, heat, power and cable checks all pass. The gaming PC is the platform under review, so rule out the cheaper causes first and only suspect the hardware once a clean reinstall and a default-BIOS test still fail.
Is it safe to keep using the PC like this?
If it shuts down or blue-screens, stop heavy loads until you find the cause. Repeated hard crashes can corrupt the boot drive, so back up your data before deep testing.
Confirm the part before you buy Once the checklist points at a single component, browse the matching gaming PCs on Evetech and replace only what failed the tests.