[Voyage-linux] FTDI USB Serial Device converter disconnected

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Hi,

I'm using Alix 2D3 and Voyage 0.7.5, and I'm facing a nasty problem with the USB.
I have a device connected by USB and I have to read information from that device continuously for few months. For some reason, after a while, the USB disconnects!!!
Happened many times already and always after a random period of time (few hours 
or few days).

Has anybody of you had similar problem?

As you can see below, from my dmesg output, the USB went off after more than 2 days of activity!

[   62.583495] device tun0 entered promiscuous mode
[181469.402683] hub 1-0:1.0: port 1 disabled by hub (EMI?), re-enabling...
[181469.403667] usb 1-1: USB disconnect, address 2
[181469.406021] ftdi_sio ttyUSB0: FTDI USB Serial Device converter now 
disconnected from ttyUSB0
[181469.406654] ftdi_sio 1-1:1.0: device disconnected
[181469.627963] usb 1-1: new full speed USB device using ohci_hcd and address 3
[181469.777676] usb 1-1: configuration #1 chosen from 1 choice
[181469.783296] ftdi_sio 1-1:1.0: FTDI USB Serial Device converter detected
[181469.784171] usb 1-1: Detected FT232BM
[181469.785634] usb 1-1: FTDI USB Serial Device converter now attached to 
ttyUSB1

I google it a bit but I have not found solution yet

Any comment is more than welcome

Many thanks
Davide