For people who have Bluetooth connection problems on Android it helps to clear the Bluetooth cache.
Especially after upgrading from Android 4 to 5 (Lollipop).
I had a lot of stability problems with the connection between my Nexus 7 2013 and the Amplifi FX100.
This solved all my problems (On Android 5.0.2):
Settings -> Apps -> Scroll over to All -> Select Bluetooth Share -> Clear Cache
Just to let you know.