Nothing happens when my dwellers explore the wasteland

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I'm wondering if anyone else has had this problem, and how to fix it. When I send my dwellers out into the wasteland absolutely nothing happens. I sent one dweller out for 8 hours and still nothing happened to him and he didn't bring back anything.
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How long does it take for a dweller to come back from the Wasteland?
My longest runs so far are around 36 hours of exploration and 18 hours return trip. The low level luck people I used to send out would still bring back rusty whatever guns and BB guns even towards the end of their trips. They did some times come back with a nice rifle or the like but that was rare.Can you get dwellers from exploring?
The exploration log. Exploring is an assignment you can give in Fallout Shelter. It sends out the selected Vault dweller out into the hostile wasteland to scavenge for supplies.Do dwellers heal themselves while exploring?
Overview. Stimpaks can be used directly on dwellers inside your Vault to increase their health and happiness as a result. Stimpaks can also be issued to dwellers out exploring, allowing them to heal themselves and explore for longer.Does luck affect dwellers in the Wasteland?
Luck also affects the chance of rush attempts succeeding. In the wasteland, it increases the chances of finding items when dwellers go out on quests and explore locations in the wasteland. The higher the Luck, the better the items.Fallout Shelter - Top Exploration Tips and Tricks without spending any money
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