Maintaining certification

Answer
After certification your organization will have surveillance audits.
Surveillance audits exist to check if your management system is working as designed. So, pay special attention to records. Are all the incidents being recorded? Measurements, complaints, corrective actions, non-conformities, internal audits, and management review, etc. Remember, if your organization had any minor non-conformity or observations during the certification audit, be sure that auditors will look into those issues with special care.
The context change, priorities change, objectives change. So, be aware of the need to update management system documentation. For example, a new product line, a new machine, a new market, can lead to changes in processes and procedures.

The following material will provide you more information about surveillance audits:
Article – What is an ISO 9001 surveillance audit? - https://advisera.com/9001academy/blog/2016/10/18/what-is-an-iso-9001-surveillance-audit/
Surveillance visits vs. certification audits - https://advisera.com/27001academy/knowledgebase/surveillance-visits-vs-certification-audits/
- Free webinar – How to perform an ISO 14001:2015 internal audit - https://advisera.com/14001academy/webinar/how-to-perform-an-iso-14001-2015-internal-audit-free-webinar/
- Enroll for free course - ISO 9001:2015 Internal Auditor Course - https://advisera.com/training/iso-9001-internal-auditor-course/
- book – ISO Internal Audit: A Plain English Guide - https://advisera.com/books/iso-internal-audit-plain-english-guide/