I read about a problem and that it got fixed with the Valentine's day update.
But I'm actually interested in when this event is supposed to happen. My intention to ask this is because It's still occurring in pretty inconsistent manners even after the past Valentine's-patch (so it's presumably not caused by a bug).
Just today one started to return after 2 days and 22hours. While it's true that the amount of items out of the wastelands exceeds my storage rooms, There is anyway another dweller out for more than 6 days with even more items counted and still going on...
I prepared for like 6 months a set of SPECIAL maxed dwellers with damage resistance pets and weapons in dmg ranges between 19 and 22. Now I finally reached the point and started raiding the wastelands, all my top dwellers return randomly with no obvisious reasons by complaining about an full inventory...
I see no pattern in this. What are the reasons for a dweller to decide that he has too much stuff and return? And how can I prevent this?