So it happens again, after I print something, the file that was printed is not saved any more in the gcode directory on the sdcard. I have to clear the folder of all the files and than I will work again. I don't have more than 35-40 files in there when this happens.

I would like to know what causes this.

I am now on firmware 1.19 on a duet 0.85, but it happened in older versions as well.
Web Interface version also 1.19


Thanks !

Have you ever done a scan on the SD card in a PC to check it for errors?

If in doubt, get a new SD card. I don't recall anyone else reporting a similar issue, so I don't think it's a firmware issue.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

I had this issue once - but shortly afterwards found that my power supply was giving low voltage. Reset it to the correct voltage and never saw the issue again. My (uneducated) guess is that the processor(s) was/were working at the threshold and misbehaved. Never seen it since (fingers crossed).