Android Bluetooth connection problems

I only have one BLE device, and it seems very fickle on what Android device it will work on; Out of the two phones and two tablets that support BLE, it only works sometimes on the older phone and only “reliably…ish” on the older tablet… this seem to be the case with anything, not just Blynk.

PS, your video links didn’t work for me… just the constant rotating circle.