Mini 2440 copy and share folder,, vnc

Ider
Good Morning.

my problem is this.

1. When I copy one file from my pc via network to wince Mini2240
   the connection drops.
2. If I install vncserver in MiniARM also disconnects when I work remotely.

3. Why this disconnect when I try to manipulate the mini2440 from my PC?

4. What should I do to prevent this from happening?

For example
In Windows  \\192.168.1.230
Shows me  the folder Shared
copy to Mini2440 a.txt
The connection drops