I think I would start by checking all earths for tightness and make sure there is no corrosion on any terminals. Check battery, and all connections. It sounds as though it could be a process of elimination as it could be a connections problem, a faulty ignition switch, faulty starter motor, NATS or even an engine issue. It will take a while to identify I recon as it is intermittent. As you say the battery is reading 12V, it might be worth reading the battery voltage from the + battery terminal and earthing at various points around the car to see if there is any volt drop through earth straps and such. Cant offer any suggestion as to why the trip would reset.
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