Operation stops at same point every time

I seem to have in issue in that my engraver repeatedly stops at the same point. There’s no explicit error message, but the machine stops moving (laser turns off) and the timer next to the busy indicator keeps incrementing. This doesn’t seem to be a USB issue in that I can press the “stop” button and then (for example) home the engraver without resetting the USB connection. This issue shows up at different points in different programs, but seems to usually (but not always) happen during arc moves. See Pasteboard - Uploaded Image for the output log (the failed run correspond to the last two console lines) and program state.

The relevant lines from dmesg (the “failure” does not trigger any new lines) are:
[15292.209866] usb 3-7: new full-speed USB device number 25 using xhci_hcd
[15292.360396] usb 3-7: New USB device found, idVendor=303a, idProduct=4003, bcdDevice= 1.00
[15292.360405] usb 3-7: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[15292.360408] usb 3-7: Product: Laser Master
[15292.360410] usb 3-7: Manufacturer: Ortur
[15292.360413] usb 3-7: SerialNumber: 123456
[15292.363001] cdc_acm 3-7:1.0: ttyACM4: USB ACM device

Finally, here is one file that triggers the fault: Dropbox - grid 400x380.lbrn2 - Simplify your life

I am using an Ortur Laser Master 2 Pro with a Thinkpad T14s running Ubuntu 20.04 and lightburn 1.2.00.

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