Thank you for the alert. I moved your thread to the DSEC9 Feedback section. However, the frequency of loot drops is not something we can discuss, and if it's been only several hours since your last 16GB Flash Drive dropped, then that is not uncommon, but this is something that happens across the universe with many mission chains. Some mission chains are not completed quickly, and the DSEC9 / Toulan crossover mission chain is one of them. Some of the items needed take longer than others to acquire. There are several theories about loot drops, but those come from players and their experiences, which is something else we can't address.
Many have completed the DSEC9 / Toulan crossover mission, so maybe some of them can share their experiences here and give more insight as to what worked for them the best.