Hello 360pixie,
Welcome to Apple Support Communities!
We found these steps from the manufacturer for a connection related issue:
Nearly all connectivity issues are resolved with a manual reset. You can perform a manual reset on your headphones by following these instructions:
1. Start with your headphones powered off.
2. Enter pairing mode by pressing and holding the volume+ button for 5-7 seconds. Your headphones will turn on, and then the LED light will flash red and blue.
3. Press and hold the multifunction button, volume+ button and volume- (all three buttons) button simultaneously for 3-5 seconds. You'll hear beeps and/or feel vibrations. This may take several attempts.
4. Turn your headphones off.
Your headphones are now reset and can be re-paired to your device. In addition, we suggest turning the phone off and back on again before beginning the pairing process.
This link has the full details: Bluetooth/Connectivity Issues
Try the steps on this Apple Support page if the issue remains: If a Bluetooth headset doesn’t work with Mac - Apple Support
We hope this helps to get your headset connected properly without disconnecting.
Please let us know if you have further questions.
Cheers!