Bluetooth is enabled on your device.
Firstly, the devices are correctly paired. Delete the existing Bluetooth pairing and re-establish the connection by going through the pairing process.
Power cycle both the device experiencing the Bluetooth issue and the device to which you're trying to connect.
On Android devices, you can clear the Bluetooth cache by going to Settings > Apps > Bluetooth > Storage > Clear Cache.
So you have to keep your devices away or not affected by other interferences.
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