For everyone’s reference here’s what we discovered:
- We had not included the I2C hub in our electrical design. We have now included the hub and have ALL devices connected to the I2C hub and a single data line going back to the WP8548. This resolved our ‘bus busy’ problem at boot.
- We have found one unit so far (out of five) that has had a ‘bus busy’ after several hours, which may be indicative of the problem originally referenced in this thread. This is a unit that has the I2C hub in place.