What happens after the same failure keeps recurring?

If the same cause keeps firing without a real gap, nothing new opens: it’s still the same case, collecting more evidence, because the finding’s onset is frozen for as long as the detection keeps recurring.

A gap is what changes that. If a case has already been resolved and the same cause fires again later, after the detector’s own quiet window has passed, the return is read as genuine rather than as the tail of the original spell, and that’s what reopens the case instead of opening a fresh one next to it. The history of one recurring problem stays in one place. The quiet window is set per detector, hours for a tool failure rate, longer for a duration or cost shift, so how long an absence has to last before it counts as new depends on what kind of problem it is.