I have had the same issue. The problem is that it starts at 100 (and yes, it does fluctuate slightly) and then after a minute or two, it rapidly falls to 0% – 18% regardless of the connection quality or the addition of saline. I am remaining still for way longer than 10 seconds. I could sit still for a solid minute and it wouldnt get any better. I am also using a macbook (2020 M1). Are there any other suggestions for correcting this issue?