I just started experiencing this glitch and it's a major game breaker. Randomly, I'll start getting a constant stream of radiation that won't go away. This will end up killing me. I have absolutely no idea why this is happening.
First, when I boot up the game and load a file, it loads up and I immediately get a constant "4+ RADS" or "10+ RADS". I then reload that same save from there and it goes back to normal. I have to do this for every time I decide to play the game. Next, sometimes if I fast travel to some area, I'll get "10+ RADS", but this time I can't just reload the save. Just a few minutes ago, I decided to travel to Abernathy Farms and was immediately greeted with a 10+ RADS stream. I read online that to fix this bug, simply fast travel. It did not work and if I traveled too far, I'd die the second it loaded.
At first, I thought it was associated with x-01 power armor as when I exited one suit, I got a constant stream of RADS, but I reverted that save and my current save never touched one so I have no idea where this is coming from. None of my mods touch radiation that I know of, but from the google searches I've done, this seems to be a vanilla problem.
As you can imagine, this makes the game very hard to play if I have a constant 10+ RADS because I'll have to pop Rad-X and Rad-Away every minute or so lest I die. I would greatly appreciate some help as I really don't want to have to trash the whole save as I spent over 24 hours on this save.