Just pushing the topic and giving many thanks to all the technology experts for the good advices. Whenever I didn’t use the keyboard or mouse for a while (on long flights), there were dropouts of up to 20 or 30 seconds. Now all problems are solved finding this thread and the one following by unchecking “Allow the computer to turn off this device to save power” in device manager for all usb and bt devices and controllers. Many thanks for that.
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