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Thank you everybody. In Forma's case, I didn't try any cable other than its cable from the box, since I'd read in other threads that it responds badly to other cables. Also I try not to plug/unplug too much from the device size since I had major port problems with the One's (I do the plug/ unplug on the PC dock's side instead): I had to exchange it twice and the last one died a month after the end of the two years guarantee. Luckily I have a Fnac shop not too far from me and when I went to fetch the Forma and brought back the unusable One for recycling, I was pleased that the employee managed to get me a 66 € refund. The previous exchanges were painless there too.
I wasn't clear enough about what was happening on the other devices: I was speaking of Calibre closing off often when I load many books, that is with new devices or after a factory reset.
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