Ironically, I have the same symptom, but it is solved if I apt-get
remove brltty. With brltty:

[ 7760.720000] usb 2-1: new full speed USB device using uhci_hcd and address 7
[ 7760.900000] usb 2-1: configuration #1 chosen from 1 choice
[ 7760.904000] ftdi_sio 2-1:1.0: FTDI USB Serial Device converter detected
[ 7760.904000] drivers/usb/serial/ftdi_sio.c: Detected FT232BM
[ 7760.904000] usb 2-1: FTDI USB Serial Device converter now attached to ttyUSB0
[ 7764.924000] usb 2-1: usbfs: interface 0 claimed by ftdi_sio while 'brltty' 
sets config #1
[ 7764.928000] ftdi_sio ttyUSB0: FTDI USB Serial Device converter now 
disconnected from ttyUSB0
[ 7764.928000] ftdi_sio 2-1:1.0: device disconnected
[ 7784.480000] usb 2-1: USB disconnect, address 7

(The last message is when I actually removed the USB cable, which shows
that it disconnects the ftdi_sio device on its own)

Without it:

[78258.424000] usb 2-2: new full speed USB device using uhci_hcd and address 8
[78258.604000] usb 2-2: configuration #1 chosen from 1 choice
[78258.608000] ftdi_sio 2-2:1.0: FTDI USB Serial Device converter detected
[78258.608000] drivers/usb/serial/ftdi_sio.c: Detected FT232BM
[78258.608000] usb 2-2: FTDI USB Serial Device converter now attached to ttyUSB0

Is this not a brltty bug?

-- 
 FTDI USB Serial Device converter disconnects
https://bugs.launchpad.net/bugs/122834
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