Why 3 of my 9 220 volts installed in the kitchen come on and then go out after about 15 minutes of lighting?
It is difficult to answer such a question remotely, without more information, in view of the failure noted. While connected to a 220 V installation, your spots may be powered by 12V, several transformers, which you can not locate. One of them, recessed (which is forbidden) or housed behind a non-ventilated lining, may overheat due to lack of ventilation until it is safe. Once cooled, it re-energizes the circuit, relighting the spots.
If this explanation is not correct, all you have to do is call an electrician to test the entire installation.
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