Arduino BT renamed in WT11i-A, connection problems


I am using the ArduinoBT board with the integrated WT11i-A. At the beginnig it was working fine, but now the WT seems to block the way through to the Arduino Chip. Before I could see the name "ARDUINOBT" in my device manager, now I see "WT11i-A". I can only see "ARDUINOBT" for a short time if i reboot the board. I also cannot reach the board with the Arduino software.

Also my android app cannot create a bloototh -socket with the board nomore, although it was working earlier.

Has anyone an idea how to solve the problem? Thanks in advance!