I hate the way the game forces certain missions on you without giving you the option to refuse or delay those quests. These quests are related to main quest line about the collectors, seemed to be triggered when you have recruited a certain number of companions.
I currently have seven recruited but to avoid triggering another forced quest I am not going to recruit any more players thus giving me a chance to clear up on many of the various side quests & assignments.
I have just investigated a collector ship which was a trap & after giving the Illusive man a rollocking I decided to not go after an IFF (whatever that is?) but instead focus on further developing my team.