Memory card too slow when using bluetooth audio

I have two bluetooth headsets that I've tried connecting to my One R. On the one I intend to you with the camera, if I connect the bluetooth headset and try to record video, after 7s it stops recording and prompts me that my memory card is too slow. If I use my primary bluetooth earphones (that I do not intend to use with the camera), it records fine.

I am also running the SanDisk Extreme V30 memory card recommended by Insta360, firmware v1.2.18

Can anyone help me identify why I'm getting this error, and where I can possibly find headsets that work with the camera (from what I understand, with their recent firmware update, most if not all BT headsets work?).