had a simular problem with my first attempts
Ok, this may sound dumb, but it got me good for 3 days before I finally worked it out.
Turns out my power supply, a temporary loaner from work, was cutting out around every 5 minutes. It was only by pure fluke that I was watching the needle and heard a faint click and saw the needle flicker. I tried a different supply and all was good. No more flaking problems.
Mark
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