very glitchy save file

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So, I took a break from my alphabet legacy challenge for awhile and have recently gone back to playing it again. I am currently on the sixth generation, and I have discovered that the save file has become VERY glitchy. While playing the other day, I had like five glitches happen within like fourty-five minutes of playing. Like, two wild horses ran straight through my house, one of them got stuck, and one of my sims moved from the backyard to the front yard instantaneously (cant remember what the other glitches were, as this was like three days ago) ... Grrr, is this because its such a big save file? Does anyone know if large save files cause more glitches? I really want to complete this challenge and I'm worried that its going to get too glitchy to continue playing it :/ 

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