Worcester 9.24 hearslave combination boiler GC no 47.311.02 balance flued?

The pilot light keeps going out on release of the gas valve button. I have turned the button to the right and left for 3 mins as instructed but pilot light still goes out, does the gas valve unit need replacing. Prior to this fault the boiler would go out after running the hot water for a few minutes, but never went out when just using the heating! Are the faults linked?