I've been having issues with the M5 since I bought it about 6 months ago. When we do any sort of moving shot (especially running) it produces a lot of visible vibration in the image (which coincides with feet hitting the floor). I've checked motor stiffness and tried it at various different levels but it makes no difference, it's also definitely not caused by motor oscillation (as far as I can see). Any suggestions on how to solve the problem? It's mounted with a Sony FS5.