oven profile issues

really need help!!
Our company is experiencing a change on the Quality system. one of the things that we are discovering is the amazing variation during the reflow oven and wave solder processes. this week we found that the team had not been performing the required profiles and this action produced an uncontrolled defective parts during a long time( I'm talking about years). my team gets into an agreement regarding we need to perform profiles as a priority to fit within control our processes, but they're asking about the frequency of this activity. my question is aboout that. do we need to perform it in every change over, daily , every shift, weekly, monthly or what could be your recommendation?

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