If you can rule out that infrastructure is the culprit and all evidence points at the working of the respective function itself and you are only left with creating a ticket, collect the source code and version of the function. Proceed as follows:

1. Call transaction SE37.
2. Choose Source for the source code.
3. Choose Utilities  Versions  Versions Management.
4. To speed up analysis, provide this information to the processor of your incident.