Haven't tested this yet but I was running HWInfo logging at 20ms and none of the voltages from +19V down to vcore drop or spike in the last logging event, so whatever's happening seems to be happening very suddenly


Next I removed the capacitor I originally fitted and was able to replicate the original fault of it rebooting during PrusaSlicer slicing immediately so it does seem to be causative. I then fitted a proper LC filter inline with the DC jack and the problem went away again, touch wood no reboots since. If it happens again I think I will try a +20V adapter. I do remember...

Haha yes I do. Shakey hands, I'm very prone to slipping with the probes!...