1. Ensure the CPA series is in pairing mode (LED flashing BLUE) and your audio source's Bluetooth function is enabled.
Pair a Bluetooth Device with your Windows device
https://support.microsoft.com/en-us/windows/pair-a-bluetooth-device-in-windows-2be7b51f-6ae9-b757-a3b9-95ee40c3e242
Pair a Bluetooth Device with your Mac
https://support.apple.com/en-gb/guide/mac-help/blth1004/mac
Pair a Bluetooth Device with your iPhone or iPAD
https://support.apple.com/en-us/HT204091
2. Delete the existing speaker pairing on your audio source and perform the pairing process again.
3. Ensure the speaker and the Bluetooth source are within the recommended range (5m) and without obstructions.
4. Eliminate potential sources of interference, such as other paired devices or Wi-Fi routers, that may disrupt the Bluetooth connection.
Further Reading:
Resolve Wi-Fi and Bluetooth Issues Caused by Wireless Interference
https://support.apple.com/en-us/102319