I can understand having a randomising system to keep the player interested in multiple playthoughs but it really is broken.

Let me give you a simple example. There is one closed off tiny bit of a sewer system called "Malden Drainage". I had gone in there, emptied everything, killed all the enemies and it was pretty much cleared out...done... FINISHED. So I left the drainage area and was just exiting the main pipe back to the Commonwealth when I though "I know, I will drop some of my crap in the chest back there in the drainage so I don't get bogged down". So I turn around and go back inside and lo and behold, in about 30 seconds a land mine had mysteriously appeared and blew up when I went back to the chest.

Now I know you are thinking "Perhaps he missed it on the first run" but nope. Not so. I reloaded the save I had made outside the drainage and re-ran the whole "clear out the area, leave and return" and guess what... the land mine wasn't where it blew up... IT WAS NOW SOMEWHERE ELSE... I tried this several times and it flipped between those two random positions to try and trip adventurers up.

So why are land mines randomly appearing in areas that have already been cleared? If enemies return and place them I can understand it... but this is happening too darn quickly. There should be a delay from being removed to being replaced. As it is, the system is clearly broken and ruins the feeling of immersion.