I am seeing increasing instability in my P3 Pro during descent and landing and I wonder if something is going wrong with it? First few flights I was amazed by how well it landed at the home point and how smoothly it descended. Have now flown about 20 flights and sometimes it misses the home point by a couple of metres. In descent it wobbles and even rotates, even on RTH descent. I've had to start cancelling RTH about 10m above ground and landing manually. Is this likely to be prop balance? I've balanced the props but who knows how well? Checked solar levels yesterday when it wobbled badly, thinking it may be GPS interference, but K=1 and I was out in the wide open spaces so nothing to interfere with GPS. 20 satellites. I probably should start hand catching but with it wobbling like that I'm not sure I want to risk my wrists!