I deployed VirtualHere Server on Raspberry Pi3 and a client on Kali Linux in order to connect to the ALFA Wireless Adapter, but the adapter disconnects.
pi@raspberrypi:~ $ uname -a
Linux raspberrypi 4.14.81-v7+ #1163 SMP Thu Nov 15 17:16:30 GMT 2018 armv7l GNU/Linux
pi@raspberrypi:~ $ lsusb | grep Ralink
Bus 001 Device 004: ID 148f:3070 Ralink Technology, Corp. RT2870/RT3070 Wireless Adapter
root@hellokity:~# uname -a
Linux hellokity 4.18.0-kali2-amd64 #1 SMP Debian 4.18.10-2kali1 (2018-10-09) x86_64 GNU/Linux
root@hellokity:~# lsusb | grep Ralink
Bus 005 Device 075: ID 148f:3070 Ralink Technology, Corp. RT2870/RT3070 Wireless Adapter
root@hellokity:~# lsusb | grep Ralink
root@hellokity:~# lsusb | grep Ralink
.
Have a look in journalctl or /var/log/syslog when you try to use the device. The reason why it disappears is in there