EP system suitability failures

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cdk
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EP system suitability failures

I can't get e2 of the EP system suitability requirements to pass. Methanol/Formamide, 50/50 is the solvent. I prepared the solvent fresh and cleaned the electrode and vessel multiple times and it still fails. The percent recovery in the first instance increased on one KF and decreased on the second KF used. Any suggestions or tips?