Apple II golden power supply switches off after 2 minutes

Apple II

My Apple II+ (golden) power supply can switch on my Apple II (non-plus) just fine.
However after 2-3 minutes it powers off. The only cards I have attached are a 16K memory expansion and a Disk ][ drive controller.

A replacement power supply does not suffer from this problem.

Any thoughts on what might be wrong?

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I have moved this to the hard

I have moved this to the hardware repair forum.
Apologies for the duplicate posting.

Oops

I deleted the duplicate in Hardware Repair. This is the best place for your query, anyway. The problem is almost certainly a thermal shutdown, so perhaps one of the Apple II experts can advise.