[ailurux]

Hello!
Working on the same batch of Tangaras as my last post where I was having issues flashing them, and I'm hitting another few issues:

1. Is it common for the FFC connectors to fail in such a way where they don't latch closed? I've had this on two out of the ten connectors out of my set of 5 Tangaras, and haven't had luck replacing them (this batch was pre-assembled by PCBWay, and my surface-mount rework skills aren't the best...)
2. On some of mine, the touch wheels are too sensitive and on others they don't work at all (or both on the same unit intermittently) - is there a way to debug this? Any tips that I should follow during assembly to make sure it works properly?

1. I wouldn't say that's common, in that I've not experienced that with any of the units we assembled. That sounds quite frustrating! 

2. The touch wheels are quite sensitive to any air gaps or dust or moisture between the touchwheel covers and the pcb. Our process was to use a thin double sided adhesive tape in the "cat ear" corners of the touchwheel covers, and stick them to the faceplates using the front half of a case as a guide for alignment (placing the touchwheel in its intended position in the case with double sided tape applied and pressing the faceplate onto it). 

Hope this helps!