Unfortunately, my keyboard had some time this already described disconnections and reconnection worked rarely. The Lenovo Support Delivered quickly a replacement keyboard, here the trackpoint did not work, the next business day I had the next exchange part in which the disconnections rarely occurred and were rectified by switching the keyboard. If I had the choice again, I would prefer the USB keyboard.
By the way all the computers with whom I had worked were Lenovo Thinkpads (T400 and X230) and the driver for the BT keyboard was installed.
My old, when a customer purchases something curved Perixx BT keyboard Aldi knows those crashes do not, but also has no TrackPoint and is not at all just somehow ergonomically ... you can not have everything.
