Air Pro 4 - Noise Cancelling, creates noise in right ear

Hi there,

I just got my Air Pro 4 today and have updated. When I turn on ANC, I get a loud constant noise in my right ear.  Like brown noise.

Anybody else experienced this? I tried switching to AptX instead of LDAC to see if that was the issue and have tried with and without LE enabled.  Same problem. 

Source device is a HiBy M300 running Android 13. I don't get this with Air Pro  3 or Wave Pro on the same device. 

Any suggestions?

Thanks.