Lost BLE connection

Dear all... after a lot, really a lot of tests I have no way to remember paired camera.
Any time I restart M5Stickc or M5Stack device or camera I lost connection and I cannot connect anymore until I "ERASE" device by M5Burner and re load sketch from Arduino.
At first attempt camera and devices connect together but, as said, after any reboot I lost any connection

Any idea?
Thanks