I m facing the same problem as engguan
Everytime when I wana send files frm laptop to phone, it will keep asking me to pair device.
After that, it shows that 'The name already exists' , which in fact I m using the same laptop..

Later ,i wana check my 'Paired devices' in the Settings --> Connectivity --> Bluetooth -->  Paired devices.. When i pressed it, the phone will turn off..
It is REALLY REALLY annoying..

However, there is no problem when i wana transfer files from phone to laptop