Hi, there is known problem of the Ralink RT3290. You need to install this package: rtbth-dkms-git
But before installing keep sure, that you have installed the headers of your kernel. Check which kernel you are running:
uname -r
then for example
pamac install linux57-headers
then build the dkms:
pamac build rtbth-dkms-git
after rebooting it should work.
How to use it
# Init
sudo modprobe rtbth
sudo rfkill unblock bluetooth
hcitool dev # check
# Switch off
sudo rfkill block bluetooth
# Switch on
sudo rfkill unblock bluetooth
# Shutdown
sudo pkill -2 rtbt
sudo rmmod rtbth
Good sucess 