It stated it when I plugged in the carista, my fluke voltage tester showed 12v exact so not too worried, was just chasing all options really as it’s a pain not having my van as it’s my only vehicleWhere are you measuring that 12v from?
If it's an accurate 12.0v then that's around 50% charged and the point where charging is advised.
I doubt battery voltage alone is your root cause, but low charge, or a tired battery that dips low on starting, can cause issues.