Does your VO2Max estimate change regularly?

Just wondering. I was watching a YouTube video yesterday from a runner, and he put up a snapshot of his EvoLab metrics, including VO2Max, and it looked like it changed almost every week. Mine has been stuck on the same value for about 6 months. Before that it was a point higher for about 3 months, and before that it was stuck at the same level it is now. So, I've been within the same 2 point values for about 20 months. I checked Coros' website and it said the value should be much more stable than on other systems, but mine seems excessively stable, given that I'm slowly improving my base fitness. It does have me on a very low value (25) which is about half of what Fitbit used to estimate for me. So maybe on the lower end of things it just doesn't change much? Or is mine glitching?