One flaw I have found is that you can get one with a cold solder join.
If it within waranty, return it.
If it isn't, you have nothing to lose by taking a look. I repaired one by gently pulling the center post out and found that the solder join had let go.
I was able to repair it easily. I saw another where the join let go by the bottom spring. That one went back.
How did you fix it? Solder it?