Bluetooth-copying files (> 100 KB) unmounts bluetooth-device

[acerlinux]

Hello dear Linux-God,

if I try to copy files WITH DRAG & DROP (!) bigger than ca. 100 KB per bluetooth, everytime my bluetooth-device gets unmount and the copying-status-window aborts.

If I send the file per "send file"-Dialog, it works, but this sends the file only to my phone-memory.
So it's necessary for me to copy per drag&drop to the SD-Card of my mobile, because my phone-memory isn't that big (Nokia 6303i).
If I try a file with ca. 4 KB, there is no problem.-/

I have installed Blueman, Obexftp, Thunar, Obextool.
I tried Thunar, Caja, Obextool without success.

Can anyone help? 1000 Thx for reading and helping!!! Maybe there is another way to copy the files? Browsing my phone is no problem at all.
I can't change the receive-folder to SD-Card in the phone. So this is no solution.-(

Linux Mint Maya 13 (Mate-Desktop) - 32 Bit
Acer Aspire One 751

[acerlinux]

I dont know why, but now it works.
I am using Mint 17 now. First time, it didnt work, but then I did the following, tried again and it works:

1. Reinstalled gnome-bluetooth
2. I started Blue-Devil
3. In Blue-Devil I got 3 Messages that I should fix Problems with the Visibility and I accepted (Press 3 times the FIX-Button)
4. I switched visibility of the bluetooth-adapter to "alwaya visible"
5. Then I could browse and copy big files with Blueman Applet 1.23