Well, they are all from Ebay. I bought from several sellers and can't remember them. I have two of the boards that were acting up running now without any problem. The only thing I can figure is that when I soldered the pins/headers on the board, the flux cleaner may have found it's way into the chips???? If it did this, and took a day or two to completely get out? Sounds dumb but it is all I can think of?