I have these boards that are a four layer FR4 material, we had been running them for quite awhile with no trouble, and then they started delaminating, I checked my Reflow oven profile and I was barely hitting the temps required for our paste, we then took the problem to our board house and they took responsibility saying that they might not have baked them properly and there apeared to be moisture between the layers of the board. They refunded us for boards that had problems, but the bad boards just kept on coming, we then swtiched to a different board-house and for the first 2,000 boards I didn't see any trouble, then I had one delaminate, I went through around another 1,000 good boards and then had one delaminate. I just want to see if there is something that I may be overlooking. could this be a defect in our design? seems like we would see more of a problem. and if this was a problem with the oven profile seems like it would be more consistant. So does everyone agree that this is likely the same problem from a different board-house. I just want second opinions before I persue reimbursments AGAIN. Thanks, Wayne