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Change out the 12 Volt battery with an identical unit. Go to a Vauxhall dealer and get a GM authorized unit installed. That way, no finger pointing if the issue continues after battery swap because Vauxhall asserts that the battery swap is done by 'am inexperienced person' with WRONG battery type for the car. I think that will solve the issue.

I know car batteries (the 12 volt ones) usually last longer, but this is not a car, it is a 3500 pound computer that goes 100 mph. It is different and so is the use of the 12 volt. An opinion on my part, but the weak screens are usually a subtle reminder by the car to the driver that something is electrically wrong.
 
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