Does the doc who prescribed the
Methadone know you take Klonopin too?
Methadone and benzos mixed together is typically not recommended, due to the risk of respiratory depression, and even respiratory arrest. That being said, in some cases, docs will be okay with the combination if the doses are small enough, and if the medications aren't taken all of the time, or are taken short term.
This is something you definitely need to discuss with your doctor before mixing them again.