Hi there, Outdoorgirly
I used to have this problem a bit, but found it was because I didn't have my pack set up right. The straps weren't tight enough, and would hang from my shoulders, and I never bothered to fasten the clips. Then one day, after climbing a hill somewhere, I'd had enough and dumped everything out on ground, repacked it, reset the straps and fastened the clips.
I've not been bothered since.
Now aching feet on the other hand ..