UK Auto Repair Questions?
Hello! My name is Gary.Welcome to JustAnswer.I'm reviewing your question now, and will post back with a reply shortly.
I would have the charging system looked at.
Astra has problems with the battery lead terminal crimps that cause your symptoms.
We need to scan for codes.
Possibly bonnet catch or one door lock faulty.
Alarm trigger history will show the cause.
There will be many codes set by your symptoms.
I would recommend a Vauxhall or Opel dealer tech carries out a diagnostic scan of your car.
The dealer scan tool is the best way.
It could have a body ground issue, there are many ground points.