I am trying to retrieve minute-by-minute data via DSS using TickHistoryIntradaySummaries. So far I've managed to get SPY data using chainRic, but for some days, the same query returns different results. For example, in the first fetching of data of 6th may 2019, I only got Call option data and no Put option data. While on the second fetch, the data was much more. Is there any reason behind this?