My Echo keeps loosing the radio connection, it is only for a couple of minutes and then it comes back on.
This happens quite often during the day.
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Have you tried restarting your Echo device to see if the issue persists?
To restart your device, unplug the power adapter from the back of the device or from the wall outlet. Then, plug the power adapter back in.
Also, are you experiencing this issue with any other music streaming service?
If so, you may want to check your Wi-Fi network for issues. You can use the following Help page for troubleshooting steps regarding your Wi-Fi network:
Streaming Issues on Alexa Devices
Please let me know if any of the above resolves your issue.
Another possibility is that your home broadband wi-fi is fading in and out. You might want to try a wi-fi analysis app to understand the signal strength.
Also is this a 2.4 GHz or 5Ghz network? Does restarting the router help?