For the same unresolved issue, continue the existing conversation with the new occurrence time and references. Explain whether the behavior changed after a suggested correction. That keeps the original investigation and new evidence together.
Start a separate request for a genuinely different problem, with its own action and impact. If an old issue had been resolved, mention its reference in the new report so support can distinguish recurrence from a new cause. Do not send the same large attachment repeatedly; provide the updated redacted evidence that changes the investigation.