I tried all you suggested, included the factory reset but finally I think it's just a matter of a slightly loosey button. Sometime I can't even hear the click when pushing it and I noticed that putting some pressure on the bezel around the button itself (pushing the front and the back of the device) helps, at least for the click and the sensitivity of the button apparently too.
Not that it grants the 2 sec thingy for the standby anyway. Not even sure it's worth an rma.
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