Klipper errors after 2nd M600

I am attempting to print a small part with 2 filament/color changes. The part prints the first layer fine. I then have a color change (M600). also works fine. The next two layers are printed (also fine). Then upon M660 the filament change is executed like normal but when I then press Resume, the printer errors. (whereby at the first Resume at the first filament change, I also have pressed Resume and it doesn;t error...))

14:54 MCU 'mcu' shutdown: Rescheduled timer in the past
14:54 MCU 'mcu' shutdown: Rescheduled timer in the past
This generally occurs when the micro-controller has been
requested to step at a rate higher than it is capable of
obtaining.
Once the underlying issue is corrected, use the
"FIRMWARE_RESTART" command to reset the firmware, reload the
config, and restart the host software.
Printer is shutdown
14:54 Klipper state: Shutdown
14:54 echo: Filament load complete!

(Ratrig VC3.1-300 with Orbiter 2 and Revo Voron HF)
Reduced [printer] velocity from 1000 (as per performance settings) to 800 and Accel from 15000 to 9000

Any ideas?
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