Bluetooth keyboard not active

on my Raspberry 3 with HiFiberry DAC+ I can connect my Bluetooth keyboard (Logitech K480) in “My OSMC”. However, after a reboot, the keyboard does not work. In “My OSMC” I can see the keyboard as a connected device, but with a red Bluetooth symbol (instead of blue). Klicking on the device and selecting “re-connect” leads to the message “reconnection failed”. A new search for available Bluetooth devices allows a new connection…
Before the last update (March 2017) this problem did not exist. A complete new installation using the image “OSMC_TGT_rbp2_20170322.img” did not solve the problem.
What more could I try?