The company I work for has a lot of problems in machine stability (sometimes if you pass again and again same part in the machine, it creates different results, sometimes approved, sometimes rejected). This is causing some issues on production line non conformity rate, since it can measure 4% of reject in the first place, but latter if you retest the parts, the result changes to 3%. This data sometimes is a result of engineering parameters change. Here the software engineer increases the parameter range frequently because they say they are re-conditioning the machines. This type of change, was said not to be considered part of process change management, since is known by the high management that this will happen frequently. If in some point of a IATF 16949 audit, the auditor gets to this matter, what can he say? Can this be an issue?