The Unofficial Fallout 4 Patch (UFO4P) may be the best mod available for the game.
The UFO4P aims to fix every single bug not resolved by the developers in one easy-to-install package.
Official Features include:
- Hundreds of gameplay, quest, NPC, object, item, text, and placement bugs fixed.
- Created by the authors of the Unofficial Oblivion and Skyrim Patch series.
- No unsafe changes (such as deletions of stock objects).
- Designed to be compatible with as many other mods as possible.
There is also a system in place to report any issues through the UF04P bugtracker.
You can download the unofficial patch here.
N.B The mod requires you to have updated to version 1.5.146 or greater.