Sometimes, my x40 drops the bluetooth connection to my Moto g6, then reconnects within a few sections. More annoying than a real problem. The x40 has 3.2 OS, Moto running Android 8.0. Any ideas?
This could be caused by a few things like device’s distance from the phone, signal interference, software on the device or phone and many more things. This does not consider that there are different versions of Bluetooth too and no standard. I would suggest going through the steps in the following FAQ: Garmin Connect App Bluetooth Troubleshooting