Originally Posted by
rpenmanparker
I've never seen or heard of this either. I would agree that proper preload is paramount. You could try carbon assembly paste on the steerer under the stem inner surface. That might keep things snug. Also make sure you have all the required small parts of the headset in the stack and in the right order. You may have botched the assembly of the parts.
I considered carbon paste, but everything I have ever read has indicated that the steerer/stem surfaces should be completely degreased. I might give it a go with the paste, but am a bit concerned about the grease that is the "carrier" for the grit that gives carbon paste its bite.