Thank you both!
WolfWalker, I wondered about that. I will try it with some practice yarn.
GrumpyGramma, it seems to be a problem that happened occasionally, but not as often as it has in this project. Usually I will end up with only a row or two that is looser. I'm only about 4 1/2 inches into this cardigan, and it's already looking messier than normal.
I do tend to knit tightly. I wondered if maybe I am trying to knit looser than I normally would for the purpose of the pattern gauge, and that's messing me up??
Maybe I ought to put this project aside until I can get this fixed.
I appreciate your help!