Your Mac’s Getting Too Hot
Another common issue you’ll see with older Macs is that they’ll become increasingly too hot for no apparent reason.
If you’re using a MacBook, you need to give it some room to breathe. The fans on the MacBook don’t have as much room as other computers, so try to keep it in a place where it has enough breathing room. That means avoiding putting your MacBook on your bed, couch, or someplace soft where it can get warm easily.
If your Mac’s a bit too old, you might need to stop having so many apps open simultaneously. That will force your Mac to consume more power, and it might get hotter. Likewise, avoid having too many tabs open when you’re using your browser.
If this issue comes from a hardware problem, you might need to talk to Apple support, so they can help you out. You might even want to consider increasing your Mac’s RAM, so it’s powerful enough to handle your everyday tasks.