BMW E63 Water loss and consequential problems – unresolved

Hi everyone, I have a problem and I’m pretty much at the end with my Latin.. Since I don’t really know myself I thought I was best off here.. To the vehicle BMW E63 645 Bj2005 KM ca 170.000km The vehicle had extreme water loss ( 1L in 3-4 days ) Then the vehicle was brought to the and all pipes, thermostat, water pump etc changed. 2 weeks it went well then until it started again with the water loss.. then came still un A few days later, all the lights went out during the ride, i.e. headlights & in the interior, but only for a fraction of a second. The whole thing repeated itself frequently during the ride. As if that wasn’t enough, then starting problems developed, i.e. the speed goes up and drains. Sometimes I have to try it twice, sometimes 10 times and sometimes it starts the first time. The following error message came: -P0010 Inlet camshaft control bench 1 P0010 Inlet camshaft control bench 1 P1062 Emergency running requirement variable valve drive So NWS changed and still no change. The mechanic might have meant something with Valvetronic. so this also changed and again nothing. In the next instance I would bring it to BMW but I thought I might ask here before maybe one knows about s or has a conjecture.. Thank you in advance for any help