So, I did some testing with one of the save, and we've come to some conclusions:
- This can happen when you click on the wall speakers. Just clicking on them will cause the LE
- It seems to happen also when Sims autonomously go to dance to the music
- When the LE occurs from Sim autonomy, it absolutely spams (like, 30 LEs all at once)
I've tried to find some sort of workaround, but using MC Tuner to disallow autonomy seems either difficult or impractical. I tried disallowing just about anything with dance or speaker that I could find, and the error still spammed. Using the delete object cheat seems more practical (deleting the wall speakers) but you'd still get the 4 or so LEs from just clicking on them, and they'd just respawn after each festival, anyway. For now, the only workaround that seems "worth while" is to simply avoid festivals. If anyone has found anything better, please let us know!
Update: while this error seems most common to occur in and around festivals, we've been seeing it from people who have not attended any festivals at all. It appears all stereos may be affected by this bug!. We've even seen it from Robots! Solutions/work arounds that are better than "avoiding all festivals" and "delete all stereos" would be appreciated!!