The main problem is the grip rubbers on the 1-mkii which absorb oils from the skin then stretch and loosen .. mine still has 4 years of a 66 month warranty to run ,so no need to panic ... the normal turn round time is less than a week so not really a problem till Brexit/ covid/ new owners all hit at the same time .
As a aside I have not heard of any problems with other models .. command dial problems were on the mk1 models which are now reaching the end of there life’s .. .
And to be fair Nikon’s still suffer the same problems I have put new rubber grips on at least 3 Nikon cameras in the past .
As a side effect I don’t mind my camera going back to the repair facility as the clean the sensor and check it all over as part of the service