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I would firstly check that the connections to the battery are good and not loose.
Also would be worthing checking the earth strap between the battery and the engine / body of the car.
Certainlly sounds as if its battery / earth connected as you say the clock keeps resetting.
Currently in dave_mezza2006's garage:
2014 Vauxhall Astra Limited Edition 1.4 16v VVT Turbo