ADP2442 shutdown output after some seconds

Question

Hi! 
 We are evaluating the ADP2442 ic. Our prototype is a basic dc dc converter, from 24V to 5V 
 This is the schematic (basically a copy&paste of the reference design): 
 
 If we connect the pin 6 (SYNC/MODE) to gnd (pulse skip mode), the circuit seems to work. We have 5V and we can supply current for a test load. 
 But if we use the fixed mode (pin 6 to vcc), the circuit works for a couple of seconds, and then, it shutdowns. We were looking for something strange, but at first, we dont see anything. 
 any idea or suggestion? 
 Thank you very much!!!

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ADP2442 shutdown output after some seconds