Gidday @Kimber 7mm-08
I think I have the same model/make or very similar. Always been reliable and accurate then started playing up as you describe. I found the battery terminal had started to show some corrosion build up. Scraped it clean with a tiny screw driver and its back to being reliable. Take off the battery cover, remove battery and take a close look at the contact under the battery. May be showing some oxidation or corrosion ?
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