@rew3 I don't see anything in that M122 report that would account for that problem. Here ar4 some suggestions:Which browser are you using? Have you tried a different browser? When this next happens, connect a laptop running a terminal emulator (e.g. YAT) to the Duet via USB. Then send M122 via USB and save the result. After that, send M122 P104 via USB to run a test of the SD card.