I have the same problem.....
I'm using the android app (3.8.1 (38003)) and a server on win10x32 with bluetooth. The connection will lost, but I can't reconnect. I reboot pc and tablet and it works for 2 hours and then he lost again de connection. Can you help me ? is het possible to connect with usb or usb-midi mode ?)
Tablet that I use is the Asus ZenPad 8.0