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Diode is not serving any purpose and should be used instead across the relay coil. What abourt wiping out such diode and pinning upper the node of the 5,6k resistor directly to the 12 volt supply. and change the layout of the darlington pair to the more traditional darlington configuration with the two Collectors conforming a single node with the lower leg of the 5.6k resistor and the base terminal of the output transistor . These changes will guarantee the proper ON and OFF conditions of the output transistor which as it is now switches on and itsel switches back off because it deprives itself of Base current.
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