In the past 2 weeks, have noticed that the meter gets more erratic when I draw back and release quickly - and this problem has been mentioned in the Forum many, many times!
When I hold at the top of my swing for 2-4 seconds, the meter smooths out - just like the Forum said.
Hint - it still works - just hold for a few seconds before releasing (also lets you sharpen your focus on the meter and hit 'dings' more consistently).
It works, by the way, for all brands of golf balls.