klippy shutdown after MEASURE_COREXY_BELT_TENSION

Hey guys,
I just ran the MEASURE_COREXY_BELT_TENSION macro to check my belt tension, but after a few minutes klippy rebooted and the log showed this...

20:25:03
MCU 'mcu' shutdown: Move queue overflow
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
20:25:03
Testing frequency 133 Hz
20:25:02
Testing frequency 132 Hz
20:25:02
Testing frequency 131 Hz

I use a raspi 3a+ with an octopus 1.1.

Any idea what went wrong?
regards!
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