Sorry to hear that @Ellen_Keizer!
Does the timeline show a “Data Gap” item at all? If Arc was killed / terminated for any reason, then there’ll usually be a Data Gap item in the timeline, to show the period where no recording was possible.
Although if the visits on either side of the data gap are to the same place, then sometimes the processing engine will assume that the data gap was in the middle of a single visit, and will merge the two visits together, consuming the data gap. So if you don’t see a Data Gap item in the timeline, perhaps that’s what happened.