I have come across this problem quite often this winter. What I have been doing is removing the glass and re-installing it with a slightly taller bead of urethane. I have not received any calls after doing this so from what I can tell it's working. It is only happening on the GMC models.

We've noticed the problem on vehicles with the original windshield more than windshields that have been replaced. The obvious solution is to wait for warmer weather or move south.