2 things going on then
first is that for some reason the clientrawrealtimeftp.exe is stopping, yes?
do you have ticked, restart instead of re login, in the real time ftp setup? (try setting that)
the other problem is likely to be a driver problem
try updating the silicons labs usb driver
also make sure windows is not powering down the usb (e.g selective suspend…I do have a youtube video on how to set that)