Nikon issued a “Technical Service Advisory for users of the Z 7 and Z 6 mirrorless cameras”:
Thank you for choosing Nikon for your photographic needs.
It has come to our attention that the vibration reduction (VR) function built into some Z 7 and Z 6 mirrorless cameras does not achieve its full potential. We will repair affected cameras free of charge.
Identifying affected products
To check whether or not your camera is one of those affected by this issue, click Affected Product Serial Numbers below and enter the serial number for your Z 7 or Z 6 as instructed.
Your camera’s serial number will be checked against those of affected products. If your camera is one of those affected, instructions for requesting repairs will be displayed. If your camera is not one of those to which this issue applies, rest assured that repairs to your camera are not necessary and you may continue using your camera without further concern for this issue.
Open the camera’s monitor to locate the product serial number. It is the 7-digit number printed on a label affixed to the camera body as indicated by the red frame in the image above (the Z 6 is represented in the image).
Please contact your nearest Nikon service center if you own a Nikon Z 7 or Z 6 affected by this issue. They will keep your camera, inspect it, and re-adjust or replace components as needed free of charge, even if the camera’s warranty has expired or is not valid in your region.
Requesting corrective servicing
Please direct enquiries regarding this matter to your nearest Nikon Service Centre or create a Free Service Returns Request. Nikon Service Centre’s will usually serve customers within 1-2 weeks after receiving products for servicing. For details we recommend you contact your local Service Centre.
We sincerely apologise for any inconvenience this matter may have caused you.
Nikon will continue to take all possible measures to prevent issues like this from happening again.
Once again, thank you for choosing Nikon for your photographic needs.