OP-Z disconnecting from the Android APP

Hi friends, I’m having trouble to keep my OP Z linked to the Android APP in bluetooth. They can connect but sometimes they stay connected for 15/20 minutes without problems and sometimes it disconnect all the time (every 5 minutes). Very painful to work with. I could plug the OP Z in USB but I’m using USB to link the OP-Z to Ableton Live on my mac and wanted to keep a visual of My OP Z in a different screen (my Android). Any tip, experience are welcome. Thanks in advance !