Miranda: Goes offline every 5 min/ File Transfer....

Hi,
Im kinda havin problems with miranda. Im running it from my external hard drive.
About every 5 minutes or so, it goes offline. Kinda annoying.
And the second problem, the file transfer doesn't work at all, whether sending or receiving. Do i have to chance some settings to get the fill transfer running ?
My contacts are icq and msn user.
regards,
chris