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It seems to be working OK with me. What are your system specs? Perhaps because the save is getting so large that may be the problem?
 
I had a similar problem, though mine was only a couple of years in. Turning off autosave for that new year (then turning it back on) got around the problem. There was still a bit of a pause before 1/1, so maybe the save + whatever maintenance it was doing was too much. Hasn't happened again anyway.