mine is a bit of a PITA if it is not directly within line of sight sometimes. the range is a bit intermittent depending on where the receiver is. the optical trackpad is a bit annoying too if you have a pretty high res screen and don't want to set your mouse sensitivity high just for this keyboard. the backlighting is worth the extra $10 or so it costs when that model goes on sale.
I had the same problem, I own a n5901 which i had used for over a year, got a new pc and decided to buy the n5902 for that one and like you described it would cut in and out if not in direct LOS, drove me nuts since my n5901 never did that, i finally called lenovo and got them to send me a replacement which worked fine so i would try to get a replacement for yours its probably defective too.
Incidentally lenovo support was horrible, so expect to have to make multiple calls.
Also comparing the n5901 vs the n5902 if not for the back light the n5901 is much better, its lighter and the trackball is a lot easier to use than the new trackpad thinghy
Anyone know if this works in Android? I have been using a large BT keyboard with my stick-HTPC and this would be a lot easier to hide. Does it need special drivers to run in windows or is it a standard HID?
I use my N5901 to navigate BIOS, so no driver required.
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