I disagree with this being normal. Mine did that from day one. I've always used Movi gimbals which are completely silent, so was suspicious. I could also see the image on my iPad shaking every so slightly, which is also wrong, but attributed it to video lag etc as I never saw it in the recorded image. But it got worse over time until I was getting jello, especially with the 45mm lens. I sent it back to DJI who is said they were sending a replacement (which I have yet to see). the worst of it was that I had to buy a replacement camera as we were headed out of town on a shoot.
I know it's a pain to be without, but I'd send it in. IMHO