Sometimes sound, sometimes an impact. Either way it’s pretty disruptive. I thought this was very common.

From bad to worse?

I got some cheap solder with my solder station and it was the bane of my existence. Found some leaded solder I think I got from radio shack years ago and it works so well. I hate to say it but I haven’t yet had good success with unleaded solder. Someone please save me from the brain damage.