Usb devices being reset during print

During prints I'm losing usb connection to my tool board.

Lost communication with MCU 'toolboard_t0'

Running dmesg -T shows all the devices being reset?

I've tried a new usb c cable to the toolboard.
I've tried a new powered usb hub.
I've slightly up'd the 5v voltage on the psu to approx 5.5v.
I've added ferrite cores to usb cables.
I've replaced the usb c cable going to the octopus.
I've DFU'd the toolboard and reflashed it.
All psu's have a common ground.