With iOS 14, Apple released automatic source switching between different apple devices depending on which source emits audio. If I have spotify open on both devices, and try and play music on either one, spotify connect and the switching goes into a loop where the AirPods Pro bounce between devices. I can pause, but that doesn’t help. I have to quit spotify on one of the devices to fix it.
We appreciate you taking the time to report this issue here. All the information you shared has been passed on to the right folks and they are looking into it.
In order to investigate further, we will need to gather more details. Could you share a video of what's happening exactly? That'd really help the right team to get to the bottom of this.