I think solved it. Yesterdays tests went well. The source of the problem is Windows 11 itself. I chose: controlepanel, power options, edit plan settings. display off in 15 minutes, put computer to sleep; never. Thinking that this sleep option off, would also keep the the power on for the harddisks. However, when you go to; advanced power setting and click on harddisk, turn off harddisk, you'll see that W 11 puts your harddisk into sleep mode after 20 minutes! I changed that to 9999 (max) minutes. Second thing I did was to implement a 'new working location' on a M2 SSD. I now use my harddisks for storage only. Best, René
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