MT4 on Virtual Box - trade timeout

Hi, I run mt4 on Linux with ubuntu as host. Recently I upgraded virtualbox to 4.3 and after that I started to get in MT4 error: Trade Timeout.
The error appears not immediately and can be resolve after restart of VM.
I will appreciate it very much if you could help me to resolve the issue.

I found that this is related to a virtual box linked server.
I have base1 adn base2.
base1 works fine.
I have linked1 and linked2, which are linked to base2 (offline).
linked1 and linked2 are experiencing issue.
if I create a new vps (full copy) from linked1, and start it, base1 start to experience the same issue ...

upgrade vbox to version 5 fixed the issue.

Did not fix :-( the issue reappeared ....