Do you mean that it works some time? Seems strange. Once you installed the driver it should always work. Do you have any software that blocks the driver? Does it work if you reinstall the driver?
Hi, I know this is an old post but I just had the same issue with my USB150 that I have been using for a year now. It is running the 3.105 firmware. The device has always worked great on my Windows 10 notebook but today I wanted to do some testing with the built in WIFI card on my notebook, while still using the USB150 to stream music on my tablet which was connected via WIFI to the USB-150, so instead of unplugging the USB150 from my notebook, I used the Windows’ “Network Connection” GUI and disabled the Realtek USB FE device. From that point on I could not get the USB150 to work again as a Network Device. When I plugged in my USB150, Windows would ask “CD Drive (E:) RTL_UL Select to choose what happens with this disc.” and the USB150 would not work as a network adaptor, and did not show up in the “Network Connection” GUI. I did multiple reboots, plugged in and unplugged the USB150 from my USB port multiple times, tried different USB slots and still the USB150 was enumerating as a CD Drive and not as a Network Device.
I found this post and a few other posts on USB Realtek devices mounting as CD Drives. Following the advice from other users, I went into the Device Manager, selected View and selected to Show Hidden Devices, then uninstalled and deleted the Realtek USB FE Family Controller driver, followed by a reboot of my notebook. Everything is good again with my USB150. I have done multiple reboots and hot plugged it into different USB ports on my notebook without any more issues.
In the future, I am just going to unplug the device and not disable it.