Well, I have 3 bad ones that don’t communicate and this makes perfect sense considering how bad we know the factory wave-soldering is. I’ve never put them under a microscope as I was certain the problem was SW related. I’ll test tomorrow and write back when I get a chance.

I’ll bet that SW is a problem on some, but it would be interesting to know if the bad joints cause the SW issues. The reason I say this, is that when you try to read these MCU’s and Microwires they’ll auto-erase if you don’t do it perfectly. So if the joint is bad and it gets an intermittent signal it could cause the data to be corrupted.