Salesforce Support is available to help examine and diagnose errors or unexpected application behavior however, exact steps to consistently replicate the issue are required to troubleshoot and effectively investigate.
As an analogy, say your car is making a strange noise but when you bring it to a mechanic the noise goes away. The mechanic won't be able to identify where the noise is coming from or what might be causing it. The shop might be able to make assumptions or guesses on what could be causing the sound if you mimic or record it. However, if available diagnostic methods don't allow them to identify what's causing the problem, they can't fix or replace the part causing it.
Similarly, Support may be unable to determine the cause or explanation for an issue without currently being in the error condition to investigate further.
While Salesforce Support will certainly exhaust all available resources and tools to investigate intermittent issues, there are limitations to what can be identified retroactively for past issues that are no longer reproducible. This may result in situations where Support is unable to progress a case forward without the ability to repeatedly reproduce or demonstrate an issue while logged in as an affected user to research and investigate.
In this situation, Support may request to close your case and ask that you continue to monitor the behavior with impacted users internally until you're able to replicate the behavior on demand or if/when the issue re-surfaces. Once the necessary steps to continue investigating are identified, you're welcome to re-engage Support by re-opening your case or creating a new Support case with reference to the prior case to resume troubleshooting.
Additionally, Salesforce support cannot keep a case open perpetually in the event something else might come up. If new issues come up, a new case will be required.
If an issue is identified in production, Support may require you to test the same scenario in a sandbox environment. When troubleshooting an unexpected application behavior it's necessary for Support to identify whether the source of the problem lies within core or standard application functionality or whether it's unique to customizations that have been implemented client side. In order to do this, systematic removal and re-introduction of customizations to potentially identify the source of the behavior is needed. Disabling or removal of customizations may not be possible in a production environment due to business or user impact which is why testing and troubleshooting in a sandbox is important and required.
Sandboxes are temporary environments specifically for development and testing purposes. If the issue is not occurring in your currently available sandboxes, Create, Clone, or Refresh a Sandbox to have a recent copy from production for troubleshooting. If the issue is data specific and you do not have a partial or full copy sandbox to test, either import example records or manually create them in the sandbox to attempt reproducing the problem.
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