Game Crashes on Save/Loading Screens

I've been having this problem for a few months now, where I can NOT save my game. I've been building a lot lately, and every time I exit building and try to save my lot, my game crashes on the save screen and just loops there forever. Recently, within the last couple of days, it now does the same thing when I exit a build and go straight to manage worlds, crashing on the loading menu instead. I eventually had to download the MCCC auto-save feature and make sure I had a family moved into every lot I built on so I could play with them after to trigger the auto save. I've tried 'save as' instead, but it yielded mixed results. The problem is that it doesn't always do this. I know it's got to be a mod causing it, but I have over 13,000 mods, and doing a 50/50 splice would take weeks because of the criteria involved. Usually, when I need to do 50/50, it's because my game won't start at all, but in order for me to test if the problem is still there after each round, I would have to go into build/buy and try to save my game, but even then, as I said, it saves on rare ocassions, meaning I would have no idea if the save function working would be coincidence or the cause of some faulty mod I removed. I'm here asking if there are any KNOWN mods that cause issues like these. I have LastExceptions, mod managers, and updaters, but none of them report any errors to this degree- just random animation errors, though that is also something I've been struggling with lately, but it is more manageable than my near constant game crashes. Again, I want to reiterate that I know it is probably a mod. I am not asking if that's what it is; I am asking if there are mods that have been known to cause crashes at save and loading menus. I cannot do the 50/50 method because of the type of issue I am having. 

Thank you :)