Had the same problem myself a few weeks ago.
1) Check the cpu and heatsink are clear of dust and rubbish. If CPU's overheat, the PC can also shut down.
2) If so, then yes it could well be your PSU. Give it a good blow through/clean.
If that doesn't work then it needs to be tested, you can get small testers or go to a repair shop and ask them to test it. But make sure the test is run for about 30 minutes. I had mine tested, paid money, test came out good, but it wasn't run for long enough. Tested again it failed after 15 mins.
3) If you want to avoid that route first, take out the psu, dismantle it and check the printed circuit board, if you see what looks like a yellow fluid stain under some capacitors, one of them has failed. You need to replace it. But as a replacement CPU shouldn't be too much, I wouldn't go to too much trouble, unless I wanted to have the fun of repairing it.
Does sound like an overheating problem but can also mean that some "wired" connection, when it warms up, is not making a full connection.
Before trying to trace this, ensure that not only are the fans running within the power supply but also over the cpu.
If dirty, then clean then to allow full airflow
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