@tridge Appologies for slow reply.
The guys setting up the copter using the kore carrier board were getting re-sets every few hours as they applied parameters during the config.
They swapped the orange for a new black cube on the same kore board and all works fine.
I have tried to replicate the param reset with just the cube on my desk with a USB cable but it is no-longer resetting in this configuration. I have another kore board on a box, I will try and see if I can make it reset again.