As the componets warm from room to operating temp you may see a small change, but I've never seen anything that big - except when I had a metallic grouding clamp that expanded and quit making contact. But as components come up to temp some of them do change value so you may want to look at those characteristics on the individual components. Having said that I would agree with Ed that it seems to be too large for a component value and confirm your set up and equipment. Gary
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