Thanks Bob
Yes, this is exactly what I’m trying to figure out, are connectors physically failing or are the connections “dropping out” as in losing communication 
Potential losing communication lead me to the Micropython issue posted above: Raspberry Pi Pico W I2C/Piicodev Bug [Solved]
Yes, I have 12 of this set up including 12 Pis. So 6 devices daisy chained to each Pico.
Yep, each PiicoDev device has its own pull ups. I haven’t touched the I2C pull ups.
Reading the connections guide I thought I might get away with 6 devices: PiicoDev Connection Guide - Tutorial Australia
Do you think I should cut some of the pullups, what would you recommend?
Thanks for your advice
