GBH 36 V-LI, is it working right?

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Building Trade (e.g. concrete construction, masonry, renovation, demolition)
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Hi, I recently bought a used GBH 36 V-LI drill. When on the drill only setting, it turns continuously as expected, but on any of the other settings it does a short burst then stops until I pull the trigger again and does another burst. All the bursts are exactly the same length. My old (different brand drill) didn't work like this. Is it normal or a fault? Thanks all.